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-rw-r--r--tvix/eval/src/tests/mod.rs60
-rw-r--r--tvix/eval/src/tests/nix_tests.rs207
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-fail-foldlStrict-strict-op-application.nix5
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-closure.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.nix24
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-eq.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-eq.exp.disabled1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.nix9
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix6
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.nix3
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-fromjson.nix49
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-functionargs.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-groupBy.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-groupBy.nix5
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-ind-string.nix2
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.nix50
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-path.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.nix1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.nix2
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-sort.exp2
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-sort.nix14
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp-disabled)0
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-versions.nix3
-rw-r--r--tvix/eval/src/tests/nix_tests/eval-okay-xml.exp.xml2
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-bad-antiquote-2.nix (renamed from tvix/eval/src/tests/nix_tests/eval-fail-bad-antiquote-2.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-fromTOML-timestamps.nix130
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-nonexist-path.nix (renamed from tvix/eval/src/tests/nix_tests/eval-fail-antiquoted-path.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-scope-5.nix (renamed from tvix/eval/src/tests/nix_tests/eval-fail-scope-5.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-undeclared-arg.nix (renamed from tvix/eval/src/tests/nix_tests/eval-fail-undeclared-arg.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-attrs6.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-attrs6.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-autoargs.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.flags (renamed from tvix/eval/src/tests/nix_tests/eval-okay-autoargs.flags)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-autoargs.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.nix41
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-context.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-context.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-curpos.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-curpos.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.nix9
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.flags1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.nix130
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.nix4
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-import.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-import.nix)4
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-overrides.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-overrides.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.nix12
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-path.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.nix.disabled (renamed from tvix/eval/src/tests/nix_tests/eval-okay-readDir.nix)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.nix6
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.nix)1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.exp (renamed from tvix/eval/src/tests/nix_tests/eval-okay-search-path.exp)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.flags (renamed from tvix/eval/src/tests/nix_tests/eval-okay-search-path.flags)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.nix (renamed from tvix/eval/src/tests/nix_tests/eval-okay-search-path.nix)5
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.exp1
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.nix9
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/readDir/bar (renamed from tvix/eval/src/tests/nix_tests/readDir/bar)0
-rw-r--r--tvix/eval/src/tests/nix_tests/notyetpassing/readDir/foo/git-hates-directories (renamed from tvix/eval/src/tests/nix_tests/readDir/foo/git-hates-directories)0
l---------tvix/eval/src/tests/nix_tests/notyetpassing/readDir/ldir1
l---------tvix/eval/src/tests/nix_tests/notyetpassing/readDir/linked1
-rw-r--r--tvix/eval/src/tests/nix_tests/parse-fail-eof-in-string.nix3
-rw-r--r--tvix/eval/src/tests/nix_tests/parse-okay-url.nix1
-rw-r--r--tvix/eval/src/tests/one_offs.rs36
-rw-r--r--tvix/eval/src/tests/tvix_tests/directory/default.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-thunk-error.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-notcallable.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-strong.nix6
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-deep-forced-thunk-error.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-deepseq.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-float.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-int.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-foldlStrict-strict-op-application.nix4
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-force-before-value-pointer-equality.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-function-formals-typecheck.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-getEnv-coercion.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-infinite-recursion.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-outer-value-never-pointer-equal.nix7
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-parsedrvname-coerce.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-remove.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-seq.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-fail-throw-abort-cannot-be-caught.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-access-strange-identifier.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.nix9
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-assert-thunk-condition.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attrs-inherit-literal.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-lhs.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-rhs.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.nix10
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.nix15
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.nix15
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrnames.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-compareVersions.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.nix6
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.exp2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.nix23
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.nix4
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix15
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasattr.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.nix6
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.nix4
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.exp1
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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-remove.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-remove.nix5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix14
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-seq.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-seq.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-simple-let.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-simple-with.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.nix7
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-thunked-with.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-toplevel-finaliser.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.exp.xml5
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-toxml.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-toxml.nix2
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.nix7
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-unpoison-scope.nix15
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-useless-inherit-with.nix7
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-display.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-display.nix16
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.nix6
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.nix46
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-with-in-dynamic-key.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-with-in-list.nix3
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-xml.exp.xml41
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-xml.nix7
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-assert.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-else.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-if.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-in.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-inherit.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-let.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-rec.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-then.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-with.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/lib.nix64
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys.nix9
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys2.nix12
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.nix25
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.nix34
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.nix122
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.nix28
-rw-r--r--tvix/eval/src/tests/tvix_tests/observable-eval-cache1.nix1
l---------tvix/eval/src/tests/tvix_tests/observable-eval-cache2.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/observable-eval-cache3.nix1
-rw-r--r--tvix/eval/src/tests/tvix_tests/readDir/bar0
-rw-r--r--tvix/eval/src/tests/tvix_tests/readDir/foo/.keep0
471 files changed, 2441 insertions, 228 deletions
diff --git a/tvix/eval/src/tests/mod.rs b/tvix/eval/src/tests/mod.rs
index 49ca35973e..21b5d35e6a 100644
--- a/tvix/eval/src/tests/mod.rs
+++ b/tvix/eval/src/tests/mod.rs
@@ -1,58 +1,6 @@
-use crate::eval::interpret;
-use pretty_assertions::assert_eq;
+/// Module for one-off tests which do not follow the rest of the
+/// test layout.
+mod one_offs;
 
-use test_generator::test_resources;
-
-fn eval_okay_test(code_path: &str) {
-    let base = code_path
-        .strip_suffix("nix")
-        .expect("test files always end in .nix");
-    let exp_path = format!("{}exp", base);
-
-    let code = std::fs::read_to_string(code_path).expect("should be able to read test code");
-    let exp = std::fs::read_to_string(exp_path).expect("should be able to read test expectation");
-
-    let result = interpret(&code, None, Default::default())
-        .expect("evaluation of eval-okay test should succeed");
-    let result_str = format!("{}", result);
-
-    assert_eq!(
-        result_str,
-        exp.trim(),
-        "result value representation (left) must match expectation (right)"
-    );
-}
-
-// identity-* tests contain Nix code snippets which should evaluate to
-// themselves exactly (i.e. literals).
-#[test_resources("src/tests/tvix_tests/identity-*.nix")]
-fn identity(code_path: &str) {
-    let code = std::fs::read_to_string(code_path).expect("should be able to read test code");
-
-    let result = interpret(&code, None, Default::default())
-        .expect("evaluation of identity test should succeed");
-    let result_str = format!("{}", result);
-
-    assert_eq!(
-        result_str,
-        code.trim(),
-        "result value representation (left) must match expectation (right)"
-    )
-}
-
-// eval-okay-* tests contain a snippet of Nix code, and an expectation
-// of the produced string output of the evaluator.
-//
-// These evaluations are always supposed to succeed, i.e. all snippets
-// are guaranteed to be valid Nix code.
-#[test_resources("src/tests/tvix_tests/eval-okay-*.nix")]
-fn eval_okay(code_path: &str) {
-    eval_okay_test(code_path)
-}
-
-// eval-okay-* tests from the original Nix test suite.
 #[cfg(feature = "nix_tests")]
-#[test_resources("src/tests/nix_tests/eval-okay-*.nix")]
-fn nix_eval_okay(code_path: &str) {
-    eval_okay_test(code_path)
-}
+mod nix_tests;
diff --git a/tvix/eval/src/tests/nix_tests.rs b/tvix/eval/src/tests/nix_tests.rs
new file mode 100644
index 0000000000..17968e4bdb
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests.rs
@@ -0,0 +1,207 @@
+use crate::value::Value;
+use builtin_macros::builtins;
+use pretty_assertions::assert_eq;
+use rstest::rstest;
+use std::path::PathBuf;
+
+#[builtins]
+mod mock_builtins {
+    //! Builtins which are required by language tests, but should not
+    //! actually exist in //tvix/eval.
+    use crate as tvix_eval;
+    use crate::generators::GenCo;
+    use crate::*;
+    use genawaiter::rc::Gen;
+
+    #[builtin("derivation")]
+    async fn builtin_derivation(co: GenCo, input: Value) -> Result<Value, ErrorKind> {
+        let input = input.to_attrs()?;
+        let attrs = input.update(NixAttrs::from_iter(
+            [
+                (
+                    "outPath",
+                    "/nix/store/00000000000000000000000000000000-mock",
+                ),
+                (
+                    "drvPath",
+                    "/nix/store/00000000000000000000000000000000-mock.drv",
+                ),
+                ("type", "derivation"),
+            ]
+            .into_iter(),
+        ));
+
+        Ok(Value::Attrs(Box::new(attrs)))
+    }
+}
+
+#[cfg(feature = "impure")]
+fn eval_test(code_path: PathBuf, expect_success: bool) {
+    std::env::set_var("TEST_VAR", "foo"); // for eval-okay-getenv.nix
+
+    eprintln!("path: {}", code_path.display());
+    assert_eq!(
+        code_path.extension().unwrap(),
+        "nix",
+        "test files always end in .nix"
+    );
+
+    let code = std::fs::read_to_string(&code_path).expect("should be able to read test code");
+
+    let mut eval = crate::Evaluation::new_impure();
+    eval.strict = true;
+    eval.builtins.extend(mock_builtins::builtins());
+
+    let result = eval.evaluate(code, Some(code_path.clone()));
+    let failed = match result.value {
+        Some(Value::Catchable(_)) => true,
+        _ => !result.errors.is_empty(),
+    };
+    if expect_success && failed {
+        panic!(
+            "{}: evaluation of eval-okay test should succeed, but failed with {:?}",
+            code_path.display(),
+            result.errors,
+        );
+    }
+
+    if !expect_success && failed {
+        return;
+    }
+    // !expect_success can also mean the output differs, so don't panic if the
+    // evaluation didn't fail.
+
+    let value = result.value.unwrap();
+    let result_str = value.to_string();
+
+    let exp_path = code_path.with_extension("exp");
+    if exp_path.exists() {
+        // If there's an .exp file provided alongside, compare it with the
+        // output of the NixValue .to_string() method.
+        let exp_str = std::fs::read_to_string(&exp_path).expect("unable to read .exp file");
+
+        if expect_success {
+            assert_eq!(
+                result_str,
+                exp_str.trim(),
+                "{}: result value representation (left) must match expectation (right)",
+                code_path.display()
+            );
+        } else {
+            assert_ne!(
+                result_str,
+                exp_str.trim(),
+                "{}: test passed unexpectedly!  consider moving it out of notyetpassing",
+                code_path.display()
+            );
+
+            // Early return here, we don't compare .xml outputs if this is a !
+            // expect_success test.
+            return;
+        }
+    }
+
+    let exp_xml_path = code_path.with_extension("exp.xml");
+    if exp_xml_path.exists() {
+        // If there's an XML file provided alongside, compare it with the
+        // output produced when serializing the Value as XML.
+        let exp_xml_str = std::fs::read_to_string(exp_xml_path).expect("unable to read .xml file");
+
+        let mut xml_actual_buf = Vec::new();
+        crate::builtins::value_to_xml(&mut xml_actual_buf, &value).expect("value_to_xml failed");
+
+        assert_eq!(
+            String::from_utf8(xml_actual_buf).expect("to_xml produced invalid utf-8"),
+            exp_xml_str,
+            "{}: result value representation (left) must match expectation (right)",
+            code_path.display()
+        );
+    }
+}
+
+// identity-* tests contain Nix code snippets which should evaluate to
+// themselves exactly (i.e. literals).
+#[cfg(feature = "impure")]
+#[rstest]
+fn identity(#[files("src/tests/tvix_tests/identity-*.nix")] code_path: PathBuf) {
+    use crate::EvalIO;
+
+    let code = std::fs::read_to_string(code_path).expect("should be able to read test code");
+
+    let mut eval = crate::Evaluation::new(Box::new(crate::StdIO) as Box<dyn EvalIO>, false);
+    eval.strict = true;
+
+    let result = eval.evaluate(&code, None);
+    assert!(
+        result.errors.is_empty(),
+        "evaluation of identity test failed: {:?}",
+        result.errors
+    );
+
+    let result_str = result.value.unwrap().to_string();
+
+    assert_eq!(
+        result_str,
+        code.trim(),
+        "result value representation (left) must match expectation (right)"
+    )
+}
+
+// eval-okay-* tests contain a snippet of Nix code, and an expectation
+// of the produced string output of the evaluator.
+//
+// These evaluations are always supposed to succeed, i.e. all snippets
+// are guaranteed to be valid Nix code.
+#[cfg(feature = "impure")]
+#[rstest]
+fn eval_okay(#[files("src/tests/tvix_tests/eval-okay-*.nix")] code_path: PathBuf) {
+    eval_test(code_path, true)
+}
+
+// eval-okay-* tests from the original Nix test suite.
+#[cfg(feature = "impure")]
+#[rstest]
+fn nix_eval_okay(#[files("src/tests/nix_tests/eval-okay-*.nix")] code_path: PathBuf) {
+    eval_test(code_path, true)
+}
+
+// eval-okay-* tests from the original Nix test suite which do not yet pass for tvix
+//
+// Eventually there will be none of these left, and this function
+// will disappear :)
+//
+// Please don't submit failing tests unless they're in
+// notyetpassing; this makes the test suite much more useful for
+// regression testing, since there should always be zero non-ignored
+// failing tests.
+#[cfg(feature = "impure")]
+#[rstest]
+fn nix_eval_okay_currently_failing(
+    #[files("src/tests/nix_tests/notyetpassing/eval-okay-*.nix")] code_path: PathBuf,
+) {
+    eval_test(code_path, false)
+}
+
+#[cfg(feature = "impure")]
+#[rstest]
+fn eval_okay_currently_failing(
+    #[files("src/tests/tvix_tests/notyetpassing/eval-okay-*.nix")] code_path: PathBuf,
+) {
+    eval_test(code_path, false)
+}
+
+// eval-fail-* tests contain a snippet of Nix code, which is
+// expected to fail evaluation.  The exact type of failure
+// (assertion, parse error, etc) is not currently checked.
+#[cfg(feature = "impure")]
+#[rstest]
+fn eval_fail(#[files("src/tests/tvix_tests/eval-fail-*.nix")] code_path: PathBuf) {
+    eval_test(code_path, false)
+}
+
+// eval-fail-* tests from the original Nix test suite.
+#[cfg(feature = "impure")]
+#[rstest]
+fn nix_eval_fail(#[files("src/tests/nix_tests/eval-fail-*.nix")] code_path: PathBuf) {
+    eval_test(code_path, false)
+}
diff --git a/tvix/eval/src/tests/nix_tests/eval-fail-foldlStrict-strict-op-application.nix b/tvix/eval/src/tests/nix_tests/eval-fail-foldlStrict-strict-op-application.nix
new file mode 100644
index 0000000000..1620cc76ee
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-fail-foldlStrict-strict-op-application.nix
@@ -0,0 +1,5 @@
+# Tests that the result of applying op is forced even if the value is never used
+builtins.foldl'
+  (_: f: f null)
+  null
+  [ (_: throw "Not the final value, but is still forced!") (_: 23) ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-closure.exp b/tvix/eval/src/tests/nix_tests/eval-okay-closure.exp
new file mode 100644
index 0000000000..e7dbf97816
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-closure.exp
@@ -0,0 +1 @@
+[ { foo = true; key = -13; } { foo = true; key = -12; } { foo = true; key = -11; } { foo = true; key = -9; } { foo = true; key = -8; } { foo = true; key = -7; } { foo = true; key = -5; } { foo = true; key = -4; } { foo = true; key = -3; } { key = -1; } { foo = true; key = 0; } { foo = true; key = 1; } { foo = true; key = 2; } { foo = true; key = 4; } { foo = true; key = 5; } { foo = true; key = 6; } { key = 8; } { foo = true; key = 9; } { foo = true; key = 10; } { foo = true; key = 13; } { foo = true; key = 14; } { foo = true; key = 15; } { key = 17; } { foo = true; key = 18; } { foo = true; key = 19; } { foo = true; key = 22; } { foo = true; key = 23; } { key = 26; } { foo = true; key = 27; } { foo = true; key = 28; } { foo = true; key = 31; } { foo = true; key = 32; } { key = 35; } { foo = true; key = 36; } { foo = true; key = 40; } { foo = true; key = 41; } { key = 44; } { foo = true; key = 45; } { foo = true; key = 49; } { key = 53; } { foo = true; key = 54; } { foo = true; key = 58; } { key = 62; } { foo = true; key = 67; } { key = 71; } { key = 80; } ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.nix b/tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.nix
deleted file mode 100644
index 43178bd2ee..0000000000
--- a/tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.nix
+++ /dev/null
@@ -1,24 +0,0 @@
-let
-  drv = derivation {
-    name = "fail";
-    builder = "/bin/false";
-    system = "x86_64-linux";
-    outputs = [ "out" "foo" ];
-  };
-
-  path = "${./eval-okay-context-introspection.nix}";
-
-  desired-context = {
-    "${builtins.unsafeDiscardStringContext path}" = {
-      path = true;
-    };
-    "${builtins.unsafeDiscardStringContext drv.drvPath}" = {
-      outputs = [ "foo" "out" ];
-      allOutputs = true;
-    };
-  };
-
-  legit-context = builtins.getContext "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
-
-  constructed-context = builtins.getContext (builtins.appendContext "" desired-context);
-in legit-context == constructed-context
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.exp b/tvix/eval/src/tests/nix_tests/eval-okay-eq.exp
index 27ba77ddaf..27ba77ddaf 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-context-introspection.exp
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-eq.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-eq.exp.disabled b/tvix/eval/src/tests/nix_tests/eval-okay-eq.exp.disabled
deleted file mode 100644
index 2015847b65..0000000000
--- a/tvix/eval/src/tests/nix_tests/eval-okay-eq.exp.disabled
+++ /dev/null
@@ -1 +0,0 @@
-Bool(True)
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.exp b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.nix b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.nix
new file mode 100644
index 0000000000..c666e07f3a
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-elements.nix
@@ -0,0 +1,9 @@
+# Tests that the rhs argument of op is not forced unconditionally
+let
+  lst = builtins.foldl'
+    (acc: x: acc ++ [ x ])
+    [ ]
+    [ 42 (throw "this shouldn't be evaluated") ];
+in
+
+builtins.head lst
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
new file mode 100644
index 0000000000..abcd5366ab
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
@@ -0,0 +1,6 @@
+# Checks that the nul value for the accumulator is not forced unconditionally.
+# Some languages provide a foldl' that is strict in this argument, but Nix does not.
+builtins.foldl'
+  (_: x: x)
+  (throw "This is never forced")
+  [ "but the results of applying op are" 42 ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.exp b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.exp
new file mode 100644
index 0000000000..837e12b406
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.exp
@@ -0,0 +1 @@
+500500
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.nix b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.nix
new file mode 100644
index 0000000000..3b87188d24
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-foldlStrict.nix
@@ -0,0 +1,3 @@
+with import ./lib.nix;
+
+builtins.foldl' (x: y: x + y) 0 (range 1 1000)
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-fromjson.nix b/tvix/eval/src/tests/nix_tests/eval-okay-fromjson.nix
index 102ee82b5e..e1c0f86cc4 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-fromjson.nix
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-fromjson.nix
@@ -1,36 +1,35 @@
-# RFC 7159, section 13.
 builtins.fromJSON
   ''
     {
-      "Image": {
-          "Width":  800,
-          "Height": 600,
-          "Title":  "View from 15th Floor",
-          "Thumbnail": {
-              "Url":    "http://www.example.com/image/481989943",
-              "Height": 125,
-              "Width":  100
+      "Video": {
+          "Title":  "The Penguin Chronicles",
+          "Width":  1920,
+          "Height": 1080,
+          "EmbeddedData": [3.14159, 23493,null, true  ,false, -10],
+          "Thumb": {
+              "Url":    "http://www.example.com/video/5678931",
+              "Width":  200,
+              "Height": 250
           },
-          "Animated" : false,
-          "IDs": [116, 943, 234, 38793, true  ,false,null, -100],
-          "Latitude":  37.7668,
-          "Longitude": -122.3959
+          "Subtitle" : false,
+          "Latitude":  46.2051,
+          "Longitude": 6.0723
         }
     }
   ''
 ==
-  { Image =
-    { Width = 800;
-      Height = 600;
-      Title = "View from 15th Floor";
-      Thumbnail =
-        { Url = http://www.example.com/image/481989943;
-          Height = 125;
-          Width = 100;
+  { Video =
+    { Title = "The Penguin Chronicles";
+      Width = 1920;
+      Height = 1080;
+      EmbeddedData = [ 3.14159 23493 null true false (0-10) ];
+      Thumb =
+        { Url = "http://www.example.com/video/5678931";
+          Width = 200;
+          Height = 250;
         };
-      Animated = false;
-      IDs = [ 116 943 234 38793 true false null (0-100) ];
-      Latitude = 37.7668;
-      Longitude = -122.3959;
+      Subtitle = false;
+      Latitude = 46.2051;
+      Longitude = 6.0723;
     };
   }
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-functionargs.exp b/tvix/eval/src/tests/nix_tests/eval-okay-functionargs.exp
new file mode 100644
index 0000000000..c1c9f8ffaf
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-functionargs.exp
@@ -0,0 +1 @@
+[ "stdenv" "fetchurl" "aterm-stdenv" "aterm-stdenv2" "libX11" "libXv" "mplayer-stdenv2.libXv-libX11" "mplayer-stdenv2.libXv-libX11_2" "nix-stdenv-aterm-stdenv" "nix-stdenv2-aterm2-stdenv2" ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.exp b/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.exp
new file mode 100644
index 0000000000..bfca5652a5
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.exp
@@ -0,0 +1 @@
+{ "1" = [ 9 ]; "2" = [ 8 ]; "3" = [ 13 29 ]; "4" = [ 3 4 10 11 17 18 ]; "5" = [ 0 23 26 28 ]; "6" = [ 1 12 21 27 30 ]; "7" = [ 7 22 ]; "8" = [ 14 ]; "9" = [ 19 ]; b = [ 16 25 ]; c = [ 24 ]; d = [ 2 ]; e = [ 5 6 15 31 ]; f = [ 20 ]; }
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.nix b/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.nix
new file mode 100644
index 0000000000..862d89dbd6
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-groupBy.nix
@@ -0,0 +1,5 @@
+with import ./lib.nix;
+
+builtins.groupBy (n:
+  builtins.substring 0 1 (builtins.hashString "sha256" (toString n))
+) (range 0 31)
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-ind-string.nix b/tvix/eval/src/tests/nix_tests/eval-okay-ind-string.nix
index 1669dc0648..95d59b5083 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-ind-string.nix
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-ind-string.nix
@@ -110,7 +110,7 @@ let
     And finally to interpret \n etc. as in a string: ''\n, ''\r, ''\t.
   '';
 
-  # Regression test: antiquotation in '${x}' should work, but didn't.
+  # Regression test: string interpolation in '${x}' should work, but didn't.
   s15 = let x = "bla"; in ''
     foo
     '${x}'
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.exp b/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.exp
new file mode 100644
index 0000000000..50445bc0ee
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.exp
@@ -0,0 +1 @@
+[ { } { a = 1; } { a = 1; } { a = "a"; } { m = 1; } { m = "m"; } { n = 1; } { n = "n"; } { n = 1; p = 2; } { n = "n"; p = "p"; } { n = 1; p = 2; } { n = "n"; p = "p"; } { a = "a"; b = "b"; c = "c"; d = "d"; e = "e"; f = "f"; g = "g"; h = "h"; i = "i"; j = "j"; k = "k"; l = "l"; m = "m"; n = "n"; o = "o"; p = "p"; q = "q"; r = "r"; s = "s"; t = "t"; u = "u"; v = "v"; w = "w"; x = "x"; y = "y"; z = "z"; } true ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.nix b/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.nix
new file mode 100644
index 0000000000..39d49938cc
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-intersectAttrs.nix
@@ -0,0 +1,50 @@
+let
+  alphabet =
+  { a = "a";
+    b = "b";
+    c = "c";
+    d = "d";
+    e = "e";
+    f = "f";
+    g = "g";
+    h = "h";
+    i = "i";
+    j = "j";
+    k = "k";
+    l = "l";
+    m = "m";
+    n = "n";
+    o = "o";
+    p = "p";
+    q = "q";
+    r = "r";
+    s = "s";
+    t = "t";
+    u = "u";
+    v = "v";
+    w = "w";
+    x = "x";
+    y = "y";
+    z = "z";
+  };
+  foo = {
+    inherit (alphabet) f o b a r z q u x;
+    aa = throw "aa";
+  };
+  alphabetFail = builtins.mapAttrs throw alphabet;
+in
+[ (builtins.intersectAttrs { a = abort "l1"; } { b = abort "r1"; })
+  (builtins.intersectAttrs { a = abort "l2"; } { a = 1; })
+  (builtins.intersectAttrs alphabetFail { a = 1; })
+  (builtins.intersectAttrs  { a = abort "laa"; } alphabet)
+  (builtins.intersectAttrs alphabetFail { m = 1; })
+  (builtins.intersectAttrs  { m = abort "lam"; } alphabet)
+  (builtins.intersectAttrs alphabetFail { n = 1; })
+  (builtins.intersectAttrs  { n = abort "lan"; } alphabet)
+  (builtins.intersectAttrs alphabetFail { n = 1; p = 2; })
+  (builtins.intersectAttrs  { n = abort "lan2"; p = abort "lap"; } alphabet)
+  (builtins.intersectAttrs alphabetFail { n = 1; p = 2; })
+  (builtins.intersectAttrs  { n = abort "lan2"; p = abort "lap"; } alphabet)
+  (builtins.intersectAttrs alphabetFail alphabet)
+  (builtins.intersectAttrs alphabet foo == builtins.intersectAttrs foo alphabet)
+]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-path.exp b/tvix/eval/src/tests/nix_tests/eval-okay-path.exp
new file mode 100644
index 0000000000..3ce7f82830
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-path.exp
@@ -0,0 +1 @@
+"/nix/store/ya937r4ydw0l6kayq8jkyqaips9c75jm-output"
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.exp b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.exp
new file mode 100644
index 0000000000..00750edc07
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.exp
@@ -0,0 +1 @@
+3
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.nix b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.nix
new file mode 100644
index 0000000000..694e9a13b7
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220122.nix
@@ -0,0 +1 @@
+((_: _) 1) + ((__: __) 2)
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.exp b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.exp
new file mode 100644
index 0000000000..00750edc07
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.exp
@@ -0,0 +1 @@
+3
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.nix b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.nix
new file mode 100644
index 0000000000..4855023739
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-regression-20220125.nix
@@ -0,0 +1,2 @@
+((__curPosFoo: __curPosFoo) 1) + ((__curPosBar: __curPosBar) 2)
+
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.exp b/tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.exp
deleted file mode 100644
index 72e8274d8c..0000000000
--- a/tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.exp
+++ /dev/null
@@ -1 +0,0 @@
-[ "faabar" "fbar" "fubar" "faboor" "fubar" "XaXbXcX" "X" "a_b" ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-sort.exp b/tvix/eval/src/tests/nix_tests/eval-okay-sort.exp
index 148b935163..899119e20e 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-sort.exp
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-sort.exp
@@ -1 +1 @@
-[ [ 42 77 147 249 483 526 ] [ 526 483 249 147 77 42 ] [ "bar" "fnord" "foo" "xyzzy" ] [ { key = 1; value = "foo"; } { key = 1; value = "fnord"; } { key = 2; value = "bar"; } ] ]
+[ [ 42 77 147 249 483 526 ] [ 526 483 249 147 77 42 ] [ "bar" "fnord" "foo" "xyzzy" ] [ { key = 1; value = "foo"; } { key = 1; value = "fnord"; } { key = 2; value = "bar"; } ] [ [ ] [ ] [ 1 ] [ 1 4 ] [ 1 5 ] [ 1 6 ] [ 2 ] [ 2 3 ] [ 3 ] [ 3 ] ] ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-sort.nix b/tvix/eval/src/tests/nix_tests/eval-okay-sort.nix
index 8299c3a4a3..50aa78e403 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-sort.nix
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-sort.nix
@@ -4,5 +4,17 @@ with builtins;
   (sort (x: y: y < x) [ 483 249 526 147 42 77 ])
   (sort lessThan [ "foo" "bar" "xyzzy" "fnord" ])
   (sort (x: y: x.key < y.key)
-    [ { key = 1; value = "foo"; } { key = 2; value = "bar"; } { key = 1; value = "fnord"; } ]) 
+    [ { key = 1; value = "foo"; } { key = 2; value = "bar"; } { key = 1; value = "fnord"; } ])
+  (sort lessThan [
+    [ 1 6 ]
+    [ ]
+    [ 2 3 ]
+    [ 3 ]
+    [ 1 5 ]
+    [ 2 ]
+    [ 1 ]
+    [ ]
+    [ 1 4 ]
+    [ 3 ]
+  ])
 ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp-disabled b/tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp
index f7393e847d..f7393e847d 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp-disabled
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-tail-call-1.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-versions.nix b/tvix/eval/src/tests/nix_tests/eval-okay-versions.nix
index e63c36586b..e9111f5f43 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-versions.nix
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-versions.nix
@@ -4,6 +4,7 @@ let
   name2 = "hello";
   name3 = "915resolution-0.5.2";
   name4 = "xf86-video-i810-1.7.4";
+  name5 = "name-that-ends-with-dash--1.0";
 
   eq = 0;
   lt = builtins.sub 0 1;
@@ -23,6 +24,8 @@ let
     ((builtins.parseDrvName name3).version == "0.5.2")
     ((builtins.parseDrvName name4).name == "xf86-video-i810")
     ((builtins.parseDrvName name4).version == "1.7.4")
+    ((builtins.parseDrvName name5).name == "name-that-ends-with-dash")
+    ((builtins.parseDrvName name5).version == "-1.0")
     (versionTest "1.0" "2.3" lt)
     (versionTest "2.1" "2.3" lt)
     (versionTest "2.3" "2.3" eq)
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-xml.exp.xml b/tvix/eval/src/tests/nix_tests/eval-okay-xml.exp.xml
index 92b75e0b8b..20099326cc 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-xml.exp.xml
+++ b/tvix/eval/src/tests/nix_tests/eval-okay-xml.exp.xml
@@ -31,9 +31,9 @@
     <attr name="f">
       <function>
         <attrspat>
-          <attr name="z" />
           <attr name="x" />
           <attr name="y" />
+          <attr name="z" />
         </attrspat>
       </function>
     </attr>
diff --git a/tvix/eval/src/tests/nix_tests/eval-fail-bad-antiquote-2.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-bad-antiquote-2.nix
index 3745235ce9..3745235ce9 100644
--- a/tvix/eval/src/tests/nix_tests/eval-fail-bad-antiquote-2.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-bad-antiquote-2.nix
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-fromTOML-timestamps.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-fromTOML-timestamps.nix
new file mode 100644
index 0000000000..74cff9470a
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-fromTOML-timestamps.nix
@@ -0,0 +1,130 @@
+builtins.fromTOML ''
+  key = "value"
+  bare_key = "value"
+  bare-key = "value"
+  1234 = "value"
+
+  "127.0.0.1" = "value"
+  "character encoding" = "value"
+  "ʎǝʞ" = "value"
+  'key2' = "value"
+  'quoted "value"' = "value"
+
+  name = "Orange"
+
+  physical.color = "orange"
+  physical.shape = "round"
+  site."google.com" = true
+
+  # This is legal according to the spec, but cpptoml doesn't handle it.
+  #a.b.c = 1
+  #a.d = 2
+
+  str = "I'm a string. \"You can quote me\". Name\tJos\u00E9\nLocation\tSF."
+
+  int1 = +99
+  int2 = 42
+  int3 = 0
+  int4 = -17
+  int5 = 1_000
+  int6 = 5_349_221
+  int7 = 1_2_3_4_5
+
+  hex1 = 0xDEADBEEF
+  hex2 = 0xdeadbeef
+  hex3 = 0xdead_beef
+
+  oct1 = 0o01234567
+  oct2 = 0o755
+
+  bin1 = 0b11010110
+
+  flt1 = +1.0
+  flt2 = 3.1415
+  flt3 = -0.01
+  flt4 = 5e+22
+  flt5 = 1e6
+  flt6 = -2E-2
+  flt7 = 6.626e-34
+  flt8 = 9_224_617.445_991_228_313
+
+  bool1 = true
+  bool2 = false
+
+  odt1 = 1979-05-27T07:32:00Z
+  odt2 = 1979-05-27T00:32:00-07:00
+  odt3 = 1979-05-27T00:32:00.999999-07:00
+  odt4 = 1979-05-27 07:32:00Z
+  ldt1 = 1979-05-27T07:32:00
+  ldt2 = 1979-05-27T00:32:00.999999
+  ld1 = 1979-05-27
+  lt1 = 07:32:00
+  lt2 = 00:32:00.999999
+
+  arr1 = [ 1, 2, 3 ]
+  arr2 = [ "red", "yellow", "green" ]
+  arr3 = [ [ 1, 2 ], [3, 4, 5] ]
+  arr4 = [ "all", 'strings', """are the same""", ''''type'''']
+  arr5 = [ [ 1, 2 ], ["a", "b", "c"] ]
+
+  arr7 = [
+    1, 2, 3
+  ]
+
+  arr8 = [
+    1,
+    2, # this is ok
+  ]
+
+  [table-1]
+  key1 = "some string"
+  key2 = 123
+
+
+  [table-2]
+  key1 = "another string"
+  key2 = 456
+
+  [dog."tater.man"]
+  type.name = "pug"
+
+  [a.b.c]
+  [ d.e.f ]
+  [ g .  h  . i ]
+  [ j . "ʞ" . 'l' ]
+  [x.y.z.w]
+
+  name = { first = "Tom", last = "Preston-Werner" }
+  point = { x = 1, y = 2 }
+  animal = { type.name = "pug" }
+
+  [[products]]
+  name = "Hammer"
+  sku = 738594937
+
+  [[products]]
+
+  [[products]]
+  name = "Nail"
+  sku = 284758393
+  color = "gray"
+
+  [[fruit]]
+    name = "apple"
+
+    [fruit.physical]
+      color = "red"
+      shape = "round"
+
+    [[fruit.variety]]
+      name = "red delicious"
+
+    [[fruit.variety]]
+      name = "granny smith"
+
+  [[fruit]]
+    name = "banana"
+
+    [[fruit.variety]]
+      name = "plantain"
+''
diff --git a/tvix/eval/src/tests/nix_tests/eval-fail-antiquoted-path.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-nonexist-path.nix
index f2f08107b5..f2f08107b5 100644
--- a/tvix/eval/src/tests/nix_tests/eval-fail-antiquoted-path.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-nonexist-path.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-fail-scope-5.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-scope-5.nix
index f89a65a99b..f89a65a99b 100644
--- a/tvix/eval/src/tests/nix_tests/eval-fail-scope-5.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-scope-5.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-fail-undeclared-arg.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-undeclared-arg.nix
index cafdf16362..cafdf16362 100644
--- a/tvix/eval/src/tests/nix_tests/eval-fail-undeclared-arg.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-fail-undeclared-arg.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-attrs6.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.exp
index b46938032e..b46938032e 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-attrs6.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-attrs6.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.nix
index 2e5c85483b..2e5c85483b 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-attrs6.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-attrs6.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.exp
index 7a8391786a..7a8391786a 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.flags b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.flags
index 217c7a5ae2..217c7a5ae2 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.flags
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.flags
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.nix
index 815f51b1d6..815f51b1d6 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-autoargs.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-autoargs.nix
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.exp
new file mode 100644
index 0000000000..03b400cc88
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.exp
@@ -0,0 +1 @@
+[ true true true true true true ]
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.nix
new file mode 100644
index 0000000000..50a78d946e
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.nix
@@ -0,0 +1,41 @@
+let
+  drv = derivation {
+    name = "fail";
+    builder = "/bin/false";
+    system = "x86_64-linux";
+    outputs = [ "out" "foo" ];
+  };
+
+  path = "${./eval-okay-context-introspection.nix}";
+
+  desired-context = {
+    "${builtins.unsafeDiscardStringContext path}" = {
+      path = true;
+    };
+    "${builtins.unsafeDiscardStringContext drv.drvPath}" = {
+      outputs = [ "foo" "out" ];
+      allOutputs = true;
+    };
+  };
+
+  combo-path = "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
+  legit-context = builtins.getContext combo-path;
+
+  reconstructed-path = builtins.appendContext
+    (builtins.unsafeDiscardStringContext combo-path)
+    desired-context;
+
+  # Eta rule for strings with context.
+  etaRule = str:
+    str == builtins.appendContext
+      (builtins.unsafeDiscardStringContext str)
+      (builtins.getContext str);
+
+in [
+  (legit-context == desired-context)
+  (reconstructed-path == combo-path)
+  (etaRule "foo")
+  (etaRule drv.drvPath)
+  (etaRule drv.foo.outPath)
+  (etaRule (builtins.unsafeDiscardOutputDependency drv.drvPath))
+]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-context.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.exp
index 2f535bdbc4..2f535bdbc4 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-context.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-context.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.nix
index 7b9531cfe9..7b9531cfe9 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-context.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-curpos.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.exp
index 65fd65b4d0..65fd65b4d0 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-curpos.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-curpos.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.nix
index b79553df0b..b79553df0b 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-curpos.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-curpos.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.exp
index 8e7c61ab8e..8e7c61ab8e 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.nix
index 3fb023e1cd..3fb023e1cd 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-delayed-with.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-delayed-with.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.exp
index ec04aab6ae..ec04aab6ae 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.nix
index d526cb4a21..d526cb4a21 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-eq-derivations.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-eq-derivations.nix
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.exp
new file mode 100644
index 0000000000..81f80420b9
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.exp
@@ -0,0 +1 @@
+"23;24;23;23"
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.nix
new file mode 100644
index 0000000000..d76a0d86ea
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-floor-ceil.nix
@@ -0,0 +1,9 @@
+with import ./lib.nix;
+
+let
+  n1 = builtins.floor 23.5;
+  n2 = builtins.ceil 23.5;
+  n3 = builtins.floor 23;
+  n4 = builtins.ceil 23;
+in
+  builtins.concatStringsSep ";" (map toString [ n1 n2 n3 n4 ])
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.exp
new file mode 100644
index 0000000000..08b3c69a6c
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.exp
@@ -0,0 +1 @@
+{ "1234" = "value"; "127.0.0.1" = "value"; a = { b = { c = { }; }; }; arr1 = [ 1 2 3 ]; arr2 = [ "red" "yellow" "green" ]; arr3 = [ [ 1 2 ] [ 3 4 5 ] ]; arr4 = [ "all" "strings" "are the same" "type" ]; arr5 = [ [ 1 2 ] [ "a" "b" "c" ] ]; arr7 = [ 1 2 3 ]; arr8 = [ 1 2 ]; bare-key = "value"; bare_key = "value"; bin1 = 214; bool1 = true; bool2 = false; "character encoding" = "value"; d = { e = { f = { }; }; }; dog = { "tater.man" = { type = { name = "pug"; }; }; }; flt1 = 1; flt2 = 3.1415; flt3 = -0.01; flt4 = 5e+22; flt5 = 1e+06; flt6 = -0.02; flt7 = 6.626e-34; flt8 = 9.22462e+06; fruit = [ { name = "apple"; physical = { color = "red"; shape = "round"; }; variety = [ { name = "red delicious"; } { name = "granny smith"; } ]; } { name = "banana"; variety = [ { name = "plantain"; } ]; } ]; g = { h = { i = { }; }; }; hex1 = 3735928559; hex2 = 3735928559; hex3 = 3735928559; int1 = 99; int2 = 42; int3 = 0; int4 = -17; int5 = 1000; int6 = 5349221; int7 = 12345; j = { "ʞ" = { l = { }; }; }; key = "value"; key2 = "value"; ld1 = { _type = "timestamp"; value = "1979-05-27"; }; ldt1 = { _type = "timestamp"; value = "1979-05-27T07:32:00"; }; ldt2 = { _type = "timestamp"; value = "1979-05-27T00:32:00.999999"; }; lt1 = { _type = "timestamp"; value = "07:32:00"; }; lt2 = { _type = "timestamp"; value = "00:32:00.999999"; }; name = "Orange"; oct1 = 342391; oct2 = 493; odt1 = { _type = "timestamp"; value = "1979-05-27T07:32:00Z"; }; odt2 = { _type = "timestamp"; value = "1979-05-27T00:32:00-07:00"; }; odt3 = { _type = "timestamp"; value = "1979-05-27T00:32:00.999999-07:00"; }; odt4 = { _type = "timestamp"; value = "1979-05-27T07:32:00Z"; }; physical = { color = "orange"; shape = "round"; }; products = [ { name = "Hammer"; sku = 738594937; } { } { color = "gray"; name = "Nail"; sku = 284758393; } ]; "quoted \"value\"" = "value"; site = { "google.com" = true; }; str = "I'm a string. \"You can quote me\". Name\tJosé\nLocation\tSF."; table-1 = { key1 = "some string"; key2 = 123; }; table-2 = { key1 = "another string"; key2 = 456; }; x = { y = { z = { w = { animal = { type = { name = "pug"; }; }; name = { first = "Tom"; last = "Preston-Werner"; }; point = { x = 1; y = 2; }; }; }; }; }; "ʎǝʞ" = "value"; }
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.flags b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.flags
new file mode 100644
index 0000000000..9ed39dc6ba
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.flags
@@ -0,0 +1 @@
+--extra-experimental-features parse-toml-timestamps
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.nix
new file mode 100644
index 0000000000..74cff9470a
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-fromTOML-timestamps.nix
@@ -0,0 +1,130 @@
+builtins.fromTOML ''
+  key = "value"
+  bare_key = "value"
+  bare-key = "value"
+  1234 = "value"
+
+  "127.0.0.1" = "value"
+  "character encoding" = "value"
+  "ʎǝʞ" = "value"
+  'key2' = "value"
+  'quoted "value"' = "value"
+
+  name = "Orange"
+
+  physical.color = "orange"
+  physical.shape = "round"
+  site."google.com" = true
+
+  # This is legal according to the spec, but cpptoml doesn't handle it.
+  #a.b.c = 1
+  #a.d = 2
+
+  str = "I'm a string. \"You can quote me\". Name\tJos\u00E9\nLocation\tSF."
+
+  int1 = +99
+  int2 = 42
+  int3 = 0
+  int4 = -17
+  int5 = 1_000
+  int6 = 5_349_221
+  int7 = 1_2_3_4_5
+
+  hex1 = 0xDEADBEEF
+  hex2 = 0xdeadbeef
+  hex3 = 0xdead_beef
+
+  oct1 = 0o01234567
+  oct2 = 0o755
+
+  bin1 = 0b11010110
+
+  flt1 = +1.0
+  flt2 = 3.1415
+  flt3 = -0.01
+  flt4 = 5e+22
+  flt5 = 1e6
+  flt6 = -2E-2
+  flt7 = 6.626e-34
+  flt8 = 9_224_617.445_991_228_313
+
+  bool1 = true
+  bool2 = false
+
+  odt1 = 1979-05-27T07:32:00Z
+  odt2 = 1979-05-27T00:32:00-07:00
+  odt3 = 1979-05-27T00:32:00.999999-07:00
+  odt4 = 1979-05-27 07:32:00Z
+  ldt1 = 1979-05-27T07:32:00
+  ldt2 = 1979-05-27T00:32:00.999999
+  ld1 = 1979-05-27
+  lt1 = 07:32:00
+  lt2 = 00:32:00.999999
+
+  arr1 = [ 1, 2, 3 ]
+  arr2 = [ "red", "yellow", "green" ]
+  arr3 = [ [ 1, 2 ], [3, 4, 5] ]
+  arr4 = [ "all", 'strings', """are the same""", ''''type'''']
+  arr5 = [ [ 1, 2 ], ["a", "b", "c"] ]
+
+  arr7 = [
+    1, 2, 3
+  ]
+
+  arr8 = [
+    1,
+    2, # this is ok
+  ]
+
+  [table-1]
+  key1 = "some string"
+  key2 = 123
+
+
+  [table-2]
+  key1 = "another string"
+  key2 = 456
+
+  [dog."tater.man"]
+  type.name = "pug"
+
+  [a.b.c]
+  [ d.e.f ]
+  [ g .  h  . i ]
+  [ j . "ʞ" . 'l' ]
+  [x.y.z.w]
+
+  name = { first = "Tom", last = "Preston-Werner" }
+  point = { x = 1, y = 2 }
+  animal = { type.name = "pug" }
+
+  [[products]]
+  name = "Hammer"
+  sku = 738594937
+
+  [[products]]
+
+  [[products]]
+  name = "Nail"
+  sku = 284758393
+  color = "gray"
+
+  [[fruit]]
+    name = "apple"
+
+    [fruit.physical]
+      color = "red"
+      shape = "round"
+
+    [[fruit.variety]]
+      name = "red delicious"
+
+    [[fruit.variety]]
+      name = "granny smith"
+
+  [[fruit]]
+    name = "banana"
+
+    [[fruit.variety]]
+      name = "plantain"
+''
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.exp
new file mode 100644
index 0000000000..7f9ac40e81
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.exp
@@ -0,0 +1 @@
+{ column = 11; file = "eval-okay-getattrpos-functionargs.nix"; line = 2; }
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.nix
new file mode 100644
index 0000000000..11d6bb0e3a
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-functionargs.nix
@@ -0,0 +1,4 @@
+let
+  fun = { foo }: {};
+  pos = builtins.unsafeGetAttrPos "foo" (builtins.functionArgs fun);
+in { inherit (pos) column line; file = baseNameOf pos.file; }
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.exp
index 19765bd501..19765bd501 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.nix
index 14dd38f773..14dd38f773 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos-undefined.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos-undefined.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.exp
index 469249bbc6..469249bbc6 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.nix
index ca6b079615..ca6b079615 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-getattrpos.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-getattrpos.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-import.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.exp
index c508125b55..c508125b55 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-import.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-import.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.nix
index 0b18d94131..76213a9541 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-import.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-import.nix
@@ -6,6 +6,6 @@ let
     scopedImport = attrs: fn: scopedImport (overrides // attrs) fn;
 
     builtins = builtins // overrides;
-  } // import ./lib.nix;
+  } // import ./../lib.nix;
 
-in scopedImport overrides ./imported.nix
+in scopedImport overrides ./../imported.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-overrides.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.exp
index 0cfbf08886..0cfbf08886 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-overrides.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-overrides.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.nix
index 358742b36e..358742b36e 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-overrides.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-overrides.nix
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.exp
new file mode 100644
index 0000000000..5b8ea02438
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.exp
@@ -0,0 +1 @@
+{ absolute = /foo; expr = /pwd/lang/foo/bar; home = /fake-home/foo; notfirst = /pwd/lang/bar/foo; simple = /pwd/lang/foo; slashes = /foo/bar; surrounded = /pwd/lang/a-foo-b; }
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.nix
new file mode 100644
index 0000000000..497d7c1c75
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path-antiquotation.nix
@@ -0,0 +1,12 @@
+let
+  foo = "foo";
+in
+{
+  simple = ./${foo};
+  surrounded = ./a-${foo}-b;
+  absolute = /${foo};
+  expr = ./${foo + "/bar"};
+  home = ~/${foo};
+  notfirst = ./bar/${foo};
+  slashes = /${foo}/${"bar"};
+}
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-path.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path.nix
index e67168cf3e..e67168cf3e 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-path.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-path.nix
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp
new file mode 100644
index 0000000000..6413f6d4f9
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp
@@ -0,0 +1 @@
+{ bar = "regular"; foo = "directory"; ldir = "symlink"; linked = "symlink"; }
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-readDir.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.nix.disabled
index a7ec9292aa..a7ec9292aa 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-readDir.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.nix.disabled
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.exp
new file mode 100644
index 0000000000..6413f6d4f9
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.exp
@@ -0,0 +1 @@
+{ bar = "regular"; foo = "directory"; ldir = "symlink"; linked = "symlink"; }
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.nix
new file mode 100644
index 0000000000..174fb6c3a0
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readFileType.nix
@@ -0,0 +1,6 @@
+{
+  bar    = builtins.readFileType ./readDir/bar;
+  foo    = builtins.readFileType ./readDir/foo;
+  linked = builtins.readFileType ./readDir/linked;
+  ldir   = builtins.readFileType ./readDir/ldir;
+}
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.exp
new file mode 100644
index 0000000000..eac67c5fed
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.exp
@@ -0,0 +1 @@
+[ "faabar" "fbar" "fubar" "faboor" "fubar" "XaXbXcX" "X" "a_b" "fubar" ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.nix
index bd8031fc00..a803e65199 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-replacestrings.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-replacestrings.nix
@@ -8,4 +8,5 @@ with builtins;
   (replaceStrings [""] ["X"] "abc")
   (replaceStrings [""] ["X"] "")
   (replaceStrings ["-"] ["_"] "a-b")
+  (replaceStrings ["oo" "XX"] ["u" (throw "unreachable")] "foobar")
 ]
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.exp
index 4519bc406d..4519bc406d 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.exp
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.flags b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.flags
index a28e682100..a28e682100 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.flags
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.flags
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.nix
index cca41f821f..6fe33decc0 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-search-path.nix
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-search-path.nix
@@ -1,10 +1,9 @@
 with import ./lib.nix;
 with builtins;
 
-assert pathExists <nix/buildenv.nix>;
+assert isFunction (import <nix/fetchurl.nix>);
 
-assert length __nixPath == 6;
-assert length (filter (x: x.prefix == "nix") __nixPath) == 1;
+assert length __nixPath == 5;
 assert length (filter (x: baseNameOf x.path == "dir4") __nixPath) == 1;
 
 import <a.nix> + import <b.nix> + import <c.nix> + import <dir5/c.nix>
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.exp
new file mode 100644
index 0000000000..9c0b15d22b
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.exp
@@ -0,0 +1 @@
+{ "0" = { n = "0"; v = [ 5 23 29 ]; }; "1" = { n = "1"; v = [ 7 30 ]; }; "2" = { n = "2"; v = [ 18 ]; }; "4" = { n = "4"; v = [ 10 ]; }; "5" = { n = "5"; v = [ 15 25 26 31 ]; }; "6" = { n = "6"; v = [ 3 14 ]; }; "7" = { n = "7"; v = [ 12 ]; }; "8" = { n = "8"; v = [ 2 6 8 9 ]; }; "9" = { n = "9"; v = [ 0 16 ]; }; a = { n = "a"; v = [ 17 21 22 27 ]; }; c = { n = "c"; v = [ 11 24 ]; }; d = { n = "d"; v = [ 4 13 28 ]; }; e = { n = "e"; v = [ 20 ]; }; f = { n = "f"; v = [ 1 19 ]; }; }
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.nix b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.nix
new file mode 100644
index 0000000000..e5d4cdccb7
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-zipAttrsWith.nix
@@ -0,0 +1,9 @@
+with import ./../lib.nix;
+
+let
+  str = builtins.hashString "sha256" "test";
+in
+builtins.zipAttrsWith
+  (n: v: { inherit n v; })
+  (map (n: { ${builtins.substring n 1 str} = n; })
+    (range 0 31))
diff --git a/tvix/eval/src/tests/nix_tests/readDir/bar b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/bar
index e69de29bb2..e69de29bb2 100644
--- a/tvix/eval/src/tests/nix_tests/readDir/bar
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/bar
diff --git a/tvix/eval/src/tests/nix_tests/readDir/foo/git-hates-directories b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/foo/git-hates-directories
index e69de29bb2..e69de29bb2 100644
--- a/tvix/eval/src/tests/nix_tests/readDir/foo/git-hates-directories
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/foo/git-hates-directories
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/ldir b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/ldir
new file mode 120000
index 0000000000..1910281566
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/ldir
@@ -0,0 +1 @@
+foo
\ No newline at end of file
diff --git a/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/linked b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/linked
new file mode 120000
index 0000000000..c503f86a0c
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/readDir/linked
@@ -0,0 +1 @@
+foo/git-hates-directories
\ No newline at end of file
diff --git a/tvix/eval/src/tests/nix_tests/parse-fail-eof-in-string.nix b/tvix/eval/src/tests/nix_tests/parse-fail-eof-in-string.nix
new file mode 100644
index 0000000000..19775d2ec8
--- /dev/null
+++ b/tvix/eval/src/tests/nix_tests/parse-fail-eof-in-string.nix
@@ -0,0 +1,3 @@
+# https://github.com/NixOS/nix/issues/6562
+# Note that this file must not end with a newline.
+a 1"$
\ No newline at end of file
diff --git a/tvix/eval/src/tests/nix_tests/parse-okay-url.nix b/tvix/eval/src/tests/nix_tests/parse-okay-url.nix
index fce3b13ee6..08de27d0a4 100644
--- a/tvix/eval/src/tests/nix_tests/parse-okay-url.nix
+++ b/tvix/eval/src/tests/nix_tests/parse-okay-url.nix
@@ -3,5 +3,6 @@
   http://www2.mplayerhq.hu/MPlayer/releases/fonts/font-arial-iso-8859-1.tar.bz2
   http://losser.st-lab.cs.uu.nl/~armijn/.nix/gcc-3.3.4-static-nix.tar.gz
   http://fpdownload.macromedia.com/get/shockwave/flash/english/linux/7.0r25/install_flash_player_7_linux.tar.gz
+  https://ftp5.gwdg.de/pub/linux/archlinux/extra/os/x86_64/unzip-6.0-14-x86_64.pkg.tar.zst
   ftp://ftp.gtk.org/pub/gtk/v1.2/gtk+-1.2.10.tar.gz
 ]
diff --git a/tvix/eval/src/tests/one_offs.rs b/tvix/eval/src/tests/one_offs.rs
new file mode 100644
index 0000000000..21e9144baf
--- /dev/null
+++ b/tvix/eval/src/tests/one_offs.rs
@@ -0,0 +1,36 @@
+use crate::*;
+
+#[test]
+fn test_source_builtin() {
+    // Test an evaluation with a source-only builtin. The test ensures
+    // that the artificially constructed thunking is correct.
+
+    let mut eval = Evaluation::new_pure();
+    eval.src_builtins.push(("testSourceBuiltin", "42"));
+
+    let result = eval.evaluate("builtins.testSourceBuiltin", None);
+    assert!(
+        result.errors.is_empty(),
+        "evaluation failed: {:?}",
+        result.errors
+    );
+
+    let value = result.value.unwrap();
+    assert!(
+        matches!(value, Value::Integer(42)),
+        "expected the integer 42, but got {}",
+        value,
+    );
+}
+
+#[test]
+fn skip_broken_bytecode() {
+    let result = Evaluation::new_pure().evaluate(/* code = */ "x", None);
+
+    assert_eq!(result.errors.len(), 1);
+
+    assert!(matches!(
+        result.errors[0].kind,
+        ErrorKind::UnknownStaticVariable
+    ));
+}
diff --git a/tvix/eval/src/tests/tvix_tests/directory/default.nix b/tvix/eval/src/tests/tvix_tests/directory/default.nix
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/directory/default.nix
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
new file mode 100644
index 0000000000..bc7a16ded8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-substring-negative-start.nix
@@ -0,0 +1,3 @@
+# Negative start is illegal, but negative length works, see
+# eval-okay-builtins-substring-negative-length.nix
+builtins.substring (-1) 1 "Wiggly Donkers"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-thunk-error.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-thunk-error.nix
new file mode 100644
index 0000000000..6df79d13f4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-thunk-error.nix
@@ -0,0 +1 @@
+builtins.genList (_: { }.foo) 1
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-notcallable.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-notcallable.nix
new file mode 100644
index 0000000000..345b76fde0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-notcallable.nix
@@ -0,0 +1,5 @@
+# attribute sets with a non-callable `__toString` can not be
+# serialised to JSON.
+builtins.toJSON {
+  __toString = 42;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-strong.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-strong.nix
new file mode 100644
index 0000000000..d1c72dc678
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-builtins-tojson-tostring-strong.nix
@@ -0,0 +1,6 @@
+# String coercions when using builtins.toJSON on an attribute set with
+# a `__toString` attribute should be weak.
+builtins.toJSON {
+  __toString = self: self.x;
+  x = 42;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix
new file mode 100644
index 0000000000..a0cd20c470
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-closed-formals.nix
@@ -0,0 +1 @@
+({ x }: x) { x = 1; y = 2; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-deep-forced-thunk-error.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-deep-forced-thunk-error.nix
new file mode 100644
index 0000000000..b7a7583022
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-deep-forced-thunk-error.nix
@@ -0,0 +1 @@
+[ (throw "error!") ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-deepseq.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-deepseq.nix
new file mode 100644
index 0000000000..9baa49b063
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-deepseq.nix
@@ -0,0 +1 @@
+builtins.deepSeq { x = abort "foo"; } 456
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-float.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-float.nix
new file mode 100644
index 0000000000..82dd687321
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-float.nix
@@ -0,0 +1 @@
+1.0 / 0.0
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-int.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-int.nix
new file mode 100644
index 0000000000..72dca4d5e4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-division-by-zero-int.nix
@@ -0,0 +1 @@
+1 / 0
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-foldlStrict-strict-op-application.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-foldlStrict-strict-op-application.nix
new file mode 100644
index 0000000000..adc029b2f2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-foldlStrict-strict-op-application.nix
@@ -0,0 +1,4 @@
+builtins.foldl'
+  (_: f: f null)
+  (throw "This doesn't explode")
+  [ (_: throw "Not the final value, but is still forced!") (_: 23) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-force-before-value-pointer-equality.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-force-before-value-pointer-equality.nix
new file mode 100644
index 0000000000..a2182a508f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-force-before-value-pointer-equality.nix
@@ -0,0 +1,5 @@
+let
+  x = throw "I have been forced";
+in
+
+x == x
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-function-formals-typecheck.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-function-formals-typecheck.nix
new file mode 100644
index 0000000000..0108f958bf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-function-formals-typecheck.nix
@@ -0,0 +1,2 @@
+# A function with formal set arguments forces its argument set and verifies its type.
+({ ... }@args: 42) [ ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-getEnv-coercion.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-getEnv-coercion.nix
new file mode 100644
index 0000000000..fe48a5690c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-getEnv-coercion.nix
@@ -0,0 +1 @@
+builtins.getEnv { var = "PATH"; __toString = self: self.var; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-infinite-recursion.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-infinite-recursion.nix
new file mode 100644
index 0000000000..5e4fd3789c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-infinite-recursion.nix
@@ -0,0 +1 @@
+let x = x; in x
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-outer-value-never-pointer-equal.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-outer-value-never-pointer-equal.nix
new file mode 100644
index 0000000000..a8c3cedf61
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-outer-value-never-pointer-equal.nix
@@ -0,0 +1,7 @@
+# For an explanation of this behavior see //tvix/docs/value-pointer-equality.md
+let
+  x = { foo = throw "foo"; };
+in
+
+# while `builtins.seq x null` would succeed, this fails!
+x == x
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-parsedrvname-coerce.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-parsedrvname-coerce.nix
new file mode 100644
index 0000000000..a1218de3fe
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-parsedrvname-coerce.nix
@@ -0,0 +1 @@
+builtins.parseDrvName { outPath = "lol"; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-remove.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-remove.nix
new file mode 100644
index 0000000000..93dd8ccd45
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-remove.nix
@@ -0,0 +1,5 @@
+let {
+attrs = { x = 123; y = 456; };
+
+body = (removeAttrs attrs [ "x" ]).x;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-seq.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-seq.nix
new file mode 100644
index 0000000000..cddbbfd326
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-seq.nix
@@ -0,0 +1 @@
+builtins.seq (abort "foo") 2
diff --git a/tvix/eval/src/tests/tvix_tests/eval-fail-throw-abort-cannot-be-caught.nix b/tvix/eval/src/tests/tvix_tests/eval-fail-throw-abort-cannot-be-caught.nix
new file mode 100644
index 0000000000..10781cb4ea
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-fail-throw-abort-cannot-be-caught.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.throw (builtins.abort "abc"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.nix
new file mode 100644
index 0000000000..aebeca1dad
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-abort-throw-can-be-caught.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.abort (builtins.throw "abc"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-access-strange-identifier.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-access-strange-identifier.nix
index 8e282d1280..433f53dc56 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-access-strange-identifier.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-access-strange-identifier.nix
@@ -2,7 +2,8 @@ let
   # There is no syntax for accessing this identifier in an ordinary
   # way.
   "foo bar" = 42;
-in ({
+in
+({
   # but we *can* inherit it back out
   inherit "foo bar";
 })."foo bar"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.exp
new file mode 100644
index 0000000000..94ba9a881a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.exp
@@ -0,0 +1 @@
+[ /bin /binbar /binbar /binbar /binbar /bin/bar /bin/bin ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.nix
new file mode 100644
index 0000000000..462f670882
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-add-paths.nix
@@ -0,0 +1,9 @@
+[
+  (/bin + "/")
+  (/bin + "bar")
+  (let name = "bar"; in /bin + name)
+  (let name = "bar"; in /bin + "${name}")
+  (let name = "bar"; in /bin + "/" + "${name}")
+  (let name = "bar"; in /bin + "/${name}")
+  (/bin + /bin)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-assert-thunk-condition.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-assert-thunk-condition.nix
index 8934b3d8cf..ac65f5814d 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-assert-thunk-condition.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-assert-thunk-condition.nix
@@ -3,5 +3,5 @@ let
 in
 
 # The function application here will become a thunk which verifies that
-# assert forces the condition expression correctly.
+  # assert forces the condition expression correctly.
 assert condition 21 42; 21
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.nix
new file mode 100644
index 0000000000..f4ef72a88b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attempt-to-call-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (throw "fred" 5)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.nix
new file mode 100644
index 0000000000..b9d835bcc5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attr-key-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval { "${builtins.throw "a"}" = "b"; }).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-inherit-literal.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-inherit-literal.nix
index 587aec8933..9ecb4e9880 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-inherit-literal.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-inherit-literal.nix
@@ -1,2 +1,2 @@
 # the 'from' part of an `inherit` can be any expression.
-{ inherit ({a = 15;}) a; }.a
+{ inherit ({ a = 15; }) a; }.a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-lhs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-lhs.nix
index 9596be22b8..973170cdd5 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-lhs.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-lhs.nix
@@ -1 +1 @@
-{} // { a = "ok"; }
+{ } // { a = "ok"; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-rhs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-rhs.nix
index 117c011413..f51b88e93a 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-rhs.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-attrs-update-empty-rhs.nix
@@ -1 +1 @@
-{ a = "ok"; } // {}
+{ a = "ok"; } // { }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.nix
new file mode 100644
index 0000000000..240736b12a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof-propagate-catchables.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.baseNameOf (throw "jill"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.exp
new file mode 100644
index 0000000000..60a773f4af
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.exp
@@ -0,0 +1 @@
+[ "bar" "foo" "" "bar" "." "" "" "" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.nix
new file mode 100644
index 0000000000..bc59613f54
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-basenameof.nix
@@ -0,0 +1,10 @@
+[
+  (builtins.baseNameOf /foo/bar)
+  (builtins.baseNameOf "foo")
+  (builtins.baseNameOf "foo///")
+  (builtins.baseNameOf "foo/bar")
+  (builtins.baseNameOf "./.")
+  (builtins.baseNameOf "")
+  (builtins.baseNameOf /.)
+  (builtins.toString (builtins.baseNameOf /.))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.nix
new file mode 100644
index 0000000000..8902e27c45
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.all (builtins.throw "a") [ "" ]) (builtins.all (x: true) (builtins.throw "b")) (builtins.all (_: builtins.throw "x") [ "" ]) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.exp
new file mode 100644
index 0000000000..82ca7e6b6d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.exp
@@ -0,0 +1 @@
+[ true true false false false false true true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.nix
new file mode 100644
index 0000000000..12d62632dd
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-all.nix
@@ -0,0 +1,15 @@
+[
+  (builtins.all (x: x) [ ])
+  (builtins.all (x: x) [ true true true ])
+  (builtins.all (x: x) [ false false false ])
+  (builtins.all (x: x) [ true true false ])
+  (builtins.all (x: x) [ false true true ])
+
+  # evaluation should short-circuit
+  (builtins.all (x: x) [ true false (builtins.abort "should be unreachable") ])
+
+  # arbitrary functions supported
+  (builtins.all (x: x * 2 == 42) [ ])
+  (builtins.all (x: x * 2 == 42) [ 21 21 21 ])
+  (builtins.all (x: x * 2 == 42) [ 1 2 3 ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.nix
new file mode 100644
index 0000000000..8db5c0c6dc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.any (builtins.throw "a") [ "" ]) (builtins.any (x: true) (builtins.throw "b")) (builtins.any (_: builtins.throw "a") [ "" ]) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.exp
new file mode 100644
index 0000000000..d6846ac3f7
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.exp
@@ -0,0 +1 @@
+[ false true false true true true false true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.nix
new file mode 100644
index 0000000000..2c659f130b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-any.nix
@@ -0,0 +1,15 @@
+[
+  (builtins.any (x: x) [ ])
+  (builtins.any (x: x) [ true true true ])
+  (builtins.any (x: x) [ false false false ])
+  (builtins.any (x: x) [ true true false ])
+  (builtins.any (x: x) [ false true true ])
+
+  # evaluation should short-circuit
+  (builtins.any (x: x) [ false true (builtins.abort "should be unreachable") ])
+
+  # arbitrary functions supported
+  (builtins.any (x: x * 2 == 42) [ ])
+  (builtins.any (x: x * 2 == 42) [ 7 21 42 ])
+  (builtins.any (x: x * 2 == 42) [ 1 2 3 ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrnames.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrnames.nix
index 67f7dcee56..82240a0647 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrnames.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrnames.nix
@@ -1,5 +1,5 @@
 [
-  (builtins.attrNames {})
+  (builtins.attrNames { })
   (builtins.attrNames { foo = 1; bar = 2; baz = 3; })
   (builtins.attrNames { Foo = 1; bar = 2; Baz = 3; })
   (builtins.attrNames {
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.nix
new file mode 100644
index 0000000000..b8c15c8748
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues-propagate-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.attrValues (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues.nix
index 5eced31f0d..ce6c5c3816 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-attrvalues.nix
@@ -1,4 +1,4 @@
 [
-  (builtins.attrValues {})
+  (builtins.attrValues { })
   (builtins.attrValues { foo = 1; bar = 2; baz = 3; })
 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.exp
new file mode 100644
index 0000000000..27ba77ddaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.exp
@@ -0,0 +1 @@
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.nix
new file mode 100644
index 0000000000..434ccf8049
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-builtins.nix
@@ -0,0 +1 @@
+[ builtins ] == [ builtins.builtins ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.exp
new file mode 100644
index 0000000000..c3bb809c9f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.nix
new file mode 100644
index 0000000000..5385591f77
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-catattrs-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.catAttrs "a" (builtins.throw "b")) (builtins.catAttrs (builtins.throw "a") { a = 1; }) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-compareVersions.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-compareVersions.nix
index cce554b449..40a90b5070 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-compareVersions.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-compareVersions.nix
@@ -4,7 +4,7 @@ let
       ord1 = builtins.compareVersions a b;
       ord2 = builtins.compareVersions b a;
     in
-      assert ord1 == -ord2; ord1;
+    assert ord1 == -ord2; ord1;
 in
 
 [
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.exp
new file mode 100644
index 0000000000..c82ddd8a80
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.nix
new file mode 100644
index 0000000000..8071daf7fb
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.concatLists (builtins.throw "a")) (builtins.concatLists [ [ ] (builtins.throw "a") ]) (builtins.concatLists [ [ ] [ ] [ builtins.throw "a" ] ]) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.exp
new file mode 100644
index 0000000000..64ae529ac2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.exp
@@ -0,0 +1 @@
+[ [ ] [ 1 2 3 4 5 6 ] [ [ 1 ] [ 2 ] [ 3 ] ] [ 1 2 3 4 5 6 ] ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.nix
new file mode 100644
index 0000000000..19ef5eba11
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-lists.nix
@@ -0,0 +1,6 @@
+[
+  (builtins.concatLists [ ])
+  (builtins.concatLists [ [ 1 2 ] [ 3 4 ] [ 5 6 ] ])
+  (builtins.concatLists [ [ [ 1 ] [ 2 ] ] [ [ 3 ] ] [ ] ])
+  (builtins.concatLists [ [ 1 2 ] [ ] [ 3 4 ] [ ] [ 5 6 ] ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.nix
new file mode 100644
index 0000000000..740f0d3fbc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-map-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.concatMap (builtins.throw "a") [ "" ]) (builtins.concatMap (_: builtins.throw "x") [ "" ]) (builtins.concatMap (_: [ ]) (builtins.throw "a")) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.nix
new file mode 100644
index 0000000000..ce5ce4170f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-concat-strings-sep-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.concatStringsSep (builtins.throw "a") [ "" ]) (builtins.concatStringsSep "," (builtins.throw "a")) (builtins.concatStringsSep "," [ "a" (builtins.throw "a") ]) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.exp
index 73e9bc33b0..44154ba6a6 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.exp
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.exp
@@ -1 +1 @@
-[ 3 7 0 1 0 0.5 0.5 0.5 42 ]
+[ 3 7 0 1 0 0.5 0.5 0.5 42 1 1 -1 -1 -1 1 1 -1 -1 -1 1 1 -1 -1 -1 -74711 -74711 -74711 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.nix
index 98b8b74bdf..dc6ce27815 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-div.nix
@@ -8,4 +8,27 @@
   (builtins.div 1 2.0)
   (builtins.div 1.0 2.0)
   (builtins.div (builtins.div 84 4) 0.5)
+
+  # builtins.div should truncate towards 0
+  (builtins.div 3 2)
+  (builtins.div (-3) (-2))
+  (builtins.div (-3) 2)
+  (builtins.div 3 (-2))
+  (-(builtins.div 3 2))
+
+  (builtins.div 4 3)
+  (builtins.div (-4) (-3))
+  (builtins.div (-4) 3)
+  (builtins.div 4 (-3))
+  (-(builtins.div 4 3))
+
+  (builtins.div 5 3)
+  (builtins.div (-5) (-3))
+  (builtins.div (-5) 3)
+  (builtins.div 5 (-3))
+  (-(builtins.div 5 3))
+
+  (builtins.div 2147812578 (-28748))
+  (builtins.div (-2147812578) 28748)
+  (-(builtins.div 2147812578 28748))
 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.nix
new file mode 100644
index 0000000000..97be4b013c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-elemAt-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.elemAt (throw "fred") 0)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.nix
new file mode 100644
index 0000000000..98d90b01bb
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.filter (_: throw "fred") [ 3 ])).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.nix
new file mode 100644
index 0000000000..715a0ce34f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-filter-propagate-catchable.nix
@@ -0,0 +1 @@
+map (e: (builtins.tryEval e).success) [ (builtins.filter (builtins.throw "a") [ "" ]) (builtins.filter (x: true) (builtins.throw "b")) (builtins.filter (_: builtins.throw "x") [ "" ]) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.exp
new file mode 100644
index 0000000000..7bf6c63466
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false true true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.nix
new file mode 100644
index 0000000000..c11a21ce1e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-foldl-propagate-catchable.nix
@@ -0,0 +1,8 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.foldl' (builtins.throw "a") { } [{ } { } { }])
+  (builtins.foldl' (x: y: x // y) { } (builtins.throw "b"))
+  (builtins.foldl' (_: _: builtins.throw "x") { } [{ }])
+  (builtins.foldl' (x: y: x // y) (builtins.throw "x") [{ }])
+  (builtins.foldl' (x: y: x // y) { } [{ } { a = builtins.throw "z"; } { }])
+  (builtins.foldl' (x: y: x // y) { } [{ } { b = 3; a = builtins.throw "u"; } { }])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.nix
new file mode 100644
index 0000000000..aa973c1352
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-from-json-propagate-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.fromJSON (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.exp
new file mode 100644
index 0000000000..bd52bff2fa
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.exp
@@ -0,0 +1 @@
+[ true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.nix
new file mode 100644
index 0000000000..ca3e6772f2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-function-args-propagate-catchable.nix
@@ -0,0 +1,4 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.functionArgs (_: builtins.throw "a"))
+  (builtins.functionArgs (builtins.throw "b"))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.exp
new file mode 100644
index 0000000000..652df3d4da
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.exp
@@ -0,0 +1 @@
+[ true false true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.nix
new file mode 100644
index 0000000000..3d4739966e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-gen-list-propagate-catchable.nix
@@ -0,0 +1,5 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.genList (builtins.throw "a") 10)
+  (builtins.genList (i: "") (builtins.throw "b"))
+  (builtins.genList (i: builtins.throw "x") 5)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp
new file mode 100644
index 0000000000..06712ebc33
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp
@@ -0,0 +1 @@
+[ <LAMBDA> 0 1 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix
new file mode 100644
index 0000000000..e161e3b4af
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      l = builtins.genList (builtins.head self) 3;
+    in
+    [ (x: x) ] ++ l;
+in
+self
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.exp
new file mode 100644
index 0000000000..87977137a5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.exp
@@ -0,0 +1 @@
+[ { key = [ { foo = <LAMBDA>; } ]; val = null; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix
new file mode 100644
index 0000000000..f6ca340c09
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-pointer-equality.nix
@@ -0,0 +1,15 @@
+let
+  foo = x: x;
+in
+
+# key needs to be a list since it uses comparison, not equality checks:
+  # lists are comparable in Nix if all non-comparable items in them are equal (e.g.
+  # functions, attribute sets).
+builtins.genericClosure {
+  startSet = [
+    { key = [{ inherit foo; }]; val = null; }
+  ];
+  operator = { val, ... }: if val != null then [ ] else [
+    { key = [{ inherit foo; }]; val = throw "no pointer equality? 🥺👉👈"; }
+  ];
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.exp
new file mode 100644
index 0000000000..6c89e78fc4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.exp
@@ -0,0 +1 @@
+{ success = false; value = false; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.nix
new file mode 100644
index 0000000000..1dfc0bb04f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genericClosure-propagate-catchable.nix
@@ -0,0 +1 @@
+builtins.tryEval (builtins.genericClosure { operator = (_: [{ key = throw "lol"; }]); startSet = [{ key = "lol"; }]; })
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.nix
new file mode 100644
index 0000000000..ef4a042ffb
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getAttr-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.getAttr (throw "fred") "bob")).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.nix
new file mode 100644
index 0000000000..70521665ca
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-getContext-propagate-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.getContext (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.nix
new file mode 100644
index 0000000000..182601abb1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-group-by-propagate-catchable.nix
@@ -0,0 +1,5 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.groupBy (builtins.throw "a") [ "" ])
+  (builtins.groupBy (x: true) (builtins.throw "b"))
+  (builtins.groupBy (_: builtins.throw "x") [ "" ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.exp
new file mode 100644
index 0000000000..94649819ca
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.exp
@@ -0,0 +1 @@
+{ fred = [ { x = "fred"; y = "fred"; } ]; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.nix
new file mode 100644
index 0000000000..eaf48045f2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-groupby-thunk.nix
@@ -0,0 +1,5 @@
+builtins.groupBy
+  (v: v.x)
+  [ (rec { y = x; x = "fred"; }) ]
+
+
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.nix
new file mode 100644
index 0000000000..0c02a82730
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasContext-propagate-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.hasContext (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasattr.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasattr.nix
index e87e186b64..fb786b4f09 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasattr.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hasattr.nix
@@ -3,7 +3,7 @@
   (builtins.hasAttr "bar" { foo = 1; bar = 2; baz = 3; })
   (builtins.hasAttr "baz" { foo = 1; bar = 2; baz = 3; })
   (builtins.hasAttr "FOO" { foo = 1; bar = 2; baz = 3; })
-  (builtins.hasAttr "foo" {})
+  (builtins.hasAttr "foo" { })
   (builtins.hasAttr ("f" + "o" + "o") { foo = 1; })
   (builtins.hasAttr ("b" + "a" + "r") { foo = 1; })
 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.exp
new file mode 100644
index 0000000000..e00b80e561
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.exp
@@ -0,0 +1 @@
+[ "8a0614b4eaa4cffb7515ec101847e198" "8bd218cf61321d8aa05b3602b99f90d2d8cef3d6" "80ac06d74cb6c5d14af718ce8c3c1255969a1a595b76a3cf92354a95331a879a" "0edac513b6b0454705b553deda4c9b055da0939d26d2f73548862817ebeac5378cf64ff7a752ce1a0590a736735d3bbd9e8a7f04d93617cdf514313f5ab5baa4" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.nix
new file mode 100644
index 0000000000..aed723d367
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-hashString.nix
@@ -0,0 +1,6 @@
+[
+  (builtins.hashString "md5" "tvix")
+  (builtins.hashString "sha1" "tvix")
+  (builtins.hashString "sha256" "tvix")
+  (builtins.hashString "sha512" "tvix")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.exp
new file mode 100644
index 0000000000..c3bb809c9f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.nix
new file mode 100644
index 0000000000..0e69f2f6fc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-head-propagate-catchable.nix
@@ -0,0 +1,4 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.head (builtins.throw "a"))
+  (builtins.head [ (builtins.throw "a") ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.exp
new file mode 100644
index 0000000000..cefd8652b4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false false false false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.nix
new file mode 100644
index 0000000000..28cf2351f6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-isType-propagate-catchable.nix
@@ -0,0 +1,14 @@
+let
+  isTypeFns = [
+    builtins.isAttrs
+    builtins.isBool
+    builtins.isFloat
+    builtins.isFunction
+    builtins.isInt
+    builtins.isList
+    builtins.isNull
+    builtins.isPath
+    builtins.isString
+  ];
+in
+map (fn: (builtins.tryEval (fn (builtins.throw "is type"))).success) isTypeFns
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.nix
new file mode 100644
index 0000000000..037a4911ac
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.length (throw "fred"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length.nix
index ef1f638cbb..6af6915f97 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-length.nix
@@ -1,5 +1,5 @@
 [
-  (builtins.length [])
+  (builtins.length [ ])
   (builtins.length [ 1 ])
   (builtins.length [ "one" "two" "three" ])
 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.exp
new file mode 100644
index 0000000000..5ee59ced83
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false true true false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.nix
new file mode 100644
index 0000000000..91b9f889bb
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-list-to-attrs-propagate-catchable.nix
@@ -0,0 +1,7 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.listToAttrs [{ name = builtins.throw "a"; value = "b"; }])
+  (builtins.listToAttrs [{ name = "a"; value = builtins.throw "b"; }])
+  (builtins.listToAttrs [{ name = "a"; value = "b"; } { name = "c"; value = builtins.throw "d"; }])
+  (builtins.listToAttrs [{ name = "a"; value = "b"; } (builtins.throw "e")])
+  (builtins.listToAttrs (builtins.throw "f"))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp
new file mode 100644
index 0000000000..050c2c4de5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp
@@ -0,0 +1 @@
+[ <LAMBDA> 2 "." 18 "https://github.com/NixOS/nix/issues/9779" "-.-" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix
new file mode 100644
index 0000000000..932d3d0eae
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      l = builtins.map (builtins.head self) [ 2 "." 18 https://github.com/NixOS/nix/issues/9779 "-.-" ];
+    in
+    [ (x: x) ] ++ l;
+in
+self
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.exp
new file mode 100644
index 0000000000..652df3d4da
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.exp
@@ -0,0 +1 @@
+[ true false true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.nix
new file mode 100644
index 0000000000..3ebb006c3f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-propagate-catchable.nix
@@ -0,0 +1,5 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.map (builtins.throw "a") [ "" ])
+  (builtins.map (x: true) (builtins.throw "b"))
+  (builtins.map (_: builtins.throw "x") [ "" ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp
new file mode 100644
index 0000000000..7e70748ffd
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp
@@ -0,0 +1 @@
+{ a = 1; b = 2; f = <LAMBDA>; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix
new file mode 100644
index 0000000000..2946d6de17
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      s = builtins.mapAttrs self.f { a = 1; b = 2; };
+    in
+    { f = _: x: x; } // s;
+in
+self
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.nix
new file mode 100644
index 0000000000..8d00994b60
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-match-propagate-catchables.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.match (throw "foo") ".*")).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.nix
new file mode 100644
index 0000000000..c718727e74
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-parse-drv-name-propagate-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.parseDrvName (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.exp
new file mode 100644
index 0000000000..48e341f4d8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.nix
new file mode 100644
index 0000000000..1960b1790f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition-propagate-catchable.nix
@@ -0,0 +1,5 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.partition (builtins.throw "a") [ "" ])
+  (builtins.partition (x: true) (builtins.throw "b"))
+  (builtins.partition (_: builtins.throw "x") [ "" ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.exp
new file mode 100644
index 0000000000..d2390db4f5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.exp
@@ -0,0 +1 @@
+[ { right = [ 1 2 3 4 5 ]; wrong = [ ]; } { right = [ ]; wrong = [ 1 2 3 4 5 ]; } { right = [ 2 ]; wrong = [ 1 3 4 5 ]; } { right = [ [ 1 2 ] [ 3 4 ] ]; wrong = [ [ 1 ] [ 2 ] [ 3 ] ]; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.nix
new file mode 100644
index 0000000000..44022a9e0c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-partition.nix
@@ -0,0 +1,13 @@
+[
+  (builtins.partition (_: true) [ 1 2 3 4 5 ])
+  (builtins.partition (_: false) [ 1 2 3 4 5 ])
+  (builtins.partition (x: x == 2) [ 1 2 3 4 5 ])
+
+  (builtins.partition (x: (builtins.length x) > 1) [
+    [ 1 ]
+    [ 1 2 ]
+    [ 2 ]
+    [ 3 ]
+    [ 3 4 ]
+  ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.exp
new file mode 100644
index 0000000000..1e950b5aa2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.nix
new file mode 100644
index 0000000000..8ca8a414aa
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-remove-attrs-propagate-catchable.nix
@@ -0,0 +1,6 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.removeAttrs (builtins.throw "a") [ "a" ])
+  (builtins.removeAttrs { a = { }; } (builtins.throw "b"))
+  (builtins.removeAttrs { a = builtins.throw "b"; } [ "a" ])
+  (builtins.removeAttrs { "${builtins.throw "c"}" = "b"; } [ "c" ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.exp
new file mode 100644
index 0000000000..cefd8652b4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false false false false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.nix
new file mode 100644
index 0000000000..ad9734ba9a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replace-strings-propagate-catchable.nix
@@ -0,0 +1,16 @@
+map (e: (builtins.tryEval e).success) [
+  # This one may be hard to read for non-experts.
+  # Replace strings is a special built-in compared to others in the sense
+  # it might attempt to lazily evaluate things upon successful replacements,
+  # so it would not be surprising that some of the non-replacements which could throw
+  # could be ignored by laziness. It is not the case though.
+  (builtins.replaceStrings [ "a" (builtins.throw "b") ] [ "c" "d" ] "ab")
+  (builtins.replaceStrings [ "a" (builtins.throw "b") ] [ "c" "d" ] "a")
+  (builtins.replaceStrings [ "a" "b" ] [ "c" (builtins.throw "d") ] "a")
+  (builtins.replaceStrings [ "a" "b" ] [ "c" (builtins.throw "d") ] "ab")
+  (builtins.replaceStrings [ "" ] [ (builtins.throw "d") ] "ab")
+  (builtins.replaceStrings [ "a" "" ] [ "b" (builtins.throw "d") ] "ab")
+  (builtins.replaceStrings (builtins.throw "z") [ ] "ab")
+  (builtins.replaceStrings [ ] (builtins.throw "z") "ab")
+  (builtins.replaceStrings [ ] [ ] (builtins.throw "z"))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.exp
new file mode 100644
index 0000000000..9f20496c7a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.exp
@@ -0,0 +1 @@
+[ "fabir" "a" "1a1" "ABC" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.nix
new file mode 100644
index 0000000000..eea3f87a2f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-replaceStrings.nix
@@ -0,0 +1,6 @@
+[
+  (builtins.replaceStrings [ "oo" "a" ] [ "a" "i" ] "foobar")
+  (builtins.replaceStrings [ "o" ] [ "a" ] "a")
+  (builtins.replaceStrings [ "" "" ] [ "1" "2" ] "a")
+  (builtins.replaceStrings [ "a" "b" "c" ] [ "A" "B" "C" ] "abc")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.exp
new file mode 100644
index 0000000000..1e950b5aa2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.nix
new file mode 100644
index 0000000000..66ca4b98ed
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-sort-propagate-catchable.nix
@@ -0,0 +1,6 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.sort (builtins.throw "a") [ "" ])
+  (builtins.sort (x: y: true) (builtins.throw "b"))
+  (builtins.sort (_: _: builtins.throw "x") [ "" ])
+  (builtins.sort (_: _: builtins.throw "x") [ "" "" ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.exp
new file mode 100644
index 0000000000..c3bb809c9f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.nix
new file mode 100644
index 0000000000..1c86e9d6f8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-split-propagate-catchable.nix
@@ -0,0 +1,4 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.split (builtins.throw "regex") "abc")
+  (builtins.split "[^/]" (builtins.throw "string"))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.nix
new file mode 100644
index 0000000000..0668ec7de2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-splitversion-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.splitVersion (throw "fred"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.exp
new file mode 100644
index 0000000000..d181ebcff6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.nix
new file mode 100644
index 0000000000..0904acd114
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-string-length-propagate-catchable.nix
@@ -0,0 +1,4 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.stringLength (builtins.throw "a"))
+  # FIXME(raitobezarius): test coercions too.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.exp
new file mode 100644
index 0000000000..192548e949
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.exp
@@ -0,0 +1 @@
+"42"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix
new file mode 100644
index 0000000000..626ae1d1be
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-coerce.nix
@@ -0,0 +1,5 @@
+# builtins.substring uses string coercion internally
+
+builtins.substring 0 2 {
+  __toString = _: "4200";
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp
new file mode 100644
index 0000000000..e614d49940
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.exp
@@ -0,0 +1 @@
+[ "SIP dial" "Lounge" " Lounge" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix
new file mode 100644
index 0000000000..062e2c0581
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-substring-negative-length.nix
@@ -0,0 +1,5 @@
+[
+  (builtins.substring 0 (-1) "SIP dial")
+  (builtins.substring 13 (-1) "Nichtraucher Lounge")
+  (builtins.substring 12 (-2) "Nichtraucher Lounge")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.exp
new file mode 100644
index 0000000000..d4cd584d22
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false true true true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.nix
new file mode 100644
index 0000000000..b4e461e12b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tail-propagate-catchable.nix
@@ -0,0 +1,6 @@
+map (e: (builtins.tryEval e).success) [
+  (builtins.tail (builtins.throw "a"))
+  (builtins.tail [ (builtins.throw "a") ])
+  (builtins.tail [ (builtins.throw "a") "a" ])
+  (builtins.tail [ (builtins.throw "a") (builtins.throw "a") ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.exp
new file mode 100644
index 0000000000..3d4204d5a8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.exp
@@ -0,0 +1 @@
+[ 2 [ "Hans" "James" "Joachim" ] 2 [ "Clawdia" "Mynheer" ] 981 3 2 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.nix
new file mode 100644
index 0000000000..3a1c0b9821
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-thunked-function-calls.nix
@@ -0,0 +1,31 @@
+[
+  # This is independent of builtins
+  (builtins.length [ (builtins.throw "Ferge") (builtins.throw "Wehsal") ])
+  (builtins.attrNames {
+    Hans = throw "Castorp";
+    Joachim = throw "Ziemßen";
+    James = "Tienappel";
+  })
+
+  (builtins.length (builtins.map builtins.throw [ "Settembrini" "Naphta" ]))
+
+  (builtins.attrNames (builtins.mapAttrs builtins.throw {
+    Clawdia = "Chauchat";
+    Mynheer = "Peeperkorn";
+  }))
+
+  (builtins.length (builtins.genList (builtins.add "Marusja") 981))
+  (builtins.length (builtins.genList builtins.throw 3))
+
+  # These are hard to get wrong since the outer layer needs to be forced anyways
+  (builtins.length (builtins.genericClosure {
+    startSet = [
+      { key = 1; initial = true; }
+    ];
+    operator = { key, initial, ... }:
+      if initial
+      then [{ key = key - 1; initial = false; value = throw "lol"; }]
+      else [ ];
+  }))
+  (builtins.length (builtins.concatMap (m: [ m (builtins.throw m) ]) [ "Marusja" ]))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.exp
new file mode 100644
index 0000000000..ca00e3c049
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.nix
new file mode 100644
index 0000000000..8ae5e48e97
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-json-propagate-catchable.nix
@@ -0,0 +1,14 @@
+map (e: (builtins.tryEval (builtins.toJSON e)).success) [
+  (builtins.throw "a")
+  {
+    a = builtins.throw "attribute a";
+  }
+  {
+    a.b.c.d.e.f.g.h.i = builtins.throw "deep i";
+  }
+  {
+    x = 32;
+    y = builtins.throw "second argument";
+  }
+  # FIXME(raitobezarius): we would like to test coercions, i.e. `toFile` and `derivation` containing throwables.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.exp
new file mode 100644
index 0000000000..c3bb809c9f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.nix
new file mode 100644
index 0000000000..808fb8c46e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-path-propagate-catchable.nix
@@ -0,0 +1,5 @@
+map (e: (builtins.tryEval (builtins.toPath e)).success) [
+  (builtins.throw "a")
+  (./xyz + (builtins.throw "p"))
+  # FIXME: test derivations and files.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.exp
new file mode 100644
index 0000000000..ca00e3c049
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.nix
new file mode 100644
index 0000000000..7b19ff53c3
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-string-propagate-catchable.nix
@@ -0,0 +1,7 @@
+map (e: (builtins.tryEval (builtins.toString e)).success) [
+  (builtins.throw "a")
+  [ (builtins.throw "a") ]
+  [ "abc" (builtins.throw "a") ]
+  "abc${builtins.throw "c"}"
+  # FIXME: test derivations and files.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.exp
new file mode 100644
index 0000000000..366f7adf0d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false false false false true false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.nix
new file mode 100644
index 0000000000..80d9e688be
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-to-xml-propagate-catchable.nix
@@ -0,0 +1,15 @@
+map (e: (builtins.tryEval (builtins.toXML e)).success) [
+  (builtins.throw "a")
+  [ (builtins.throw "a") ]
+  [ "abc" (builtins.throw "a") ]
+  "abc${builtins.throw "c"}"
+  (_: builtins.throw "d")
+  {
+    u = builtins.throw "x";
+    v = "a";
+  }
+  {
+    u.i.w.x.z = builtins.throw "n";
+  }
+  # FIXME: test derivations and files.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.exp
index a148ebc3b5..cd5a6c0d54 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.exp
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.exp
@@ -1 +1 @@
-[ "1" "4.200000" "" "" "1" "foo" "/etc" "Hello World" "Hello World" "1" "out" "2" "1 4.200000   1 foo /etc Hello World Hello World 1 out 2" ]
+[ "" " " " /deep/thought" " 2  3" " flat" "1" "4.200000" "" "" "1" "foo" "/etc" "Hello World" "Hello World" "1" "out" "2" "    /deep/thought  2  3  flat 1 4.200000   1 foo /etc Hello World Hello World 1 out 2" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.nix
index e4dc18ac96..eb8011158f 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-toString.nix
@@ -5,19 +5,24 @@ let
   };
 
   toStringExamples = [
-    (toString 1)
-    (toString 4.2)
-    (toString null)
-    (toString false)
-    (toString true)
-    (toString "foo")
-    (toString /etc)
-    (toString toStringableSet)
-    (toString { __toString = _: toStringableSet; })
-    (toString { __toString = _: true; })
-    (toString { outPath = "out"; })
-    (toString { outPath = { outPath = { __toString = _: 2; }; }; })
+    null
+    [ null false ]
+    [ null /deep/thought ]
+    [ [ null 2 ] null 3 ]
+    [ false "flat" ]
+    1
+    4.2
+    null
+    false
+    true
+    "foo"
+    /etc
+    toStringableSet
+    { __toString = _: toStringableSet; }
+    { __toString = _: true; }
+    { outPath = "out"; }
+    { outPath = { outPath = { __toString = _: 2; }; }; }
   ];
 in
 
-toStringExamples ++ [ (toString toStringExamples) ]
+(builtins.map toString toStringExamples) ++ [ (toString toStringExamples) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.exp
new file mode 100644
index 0000000000..0a274c201f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.exp
@@ -0,0 +1 @@
+"[42,\"hello\",13.37,[],[1,2,3],{},{\"name\":\"foo\",\"value\":42},{\"foo\":42}]"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.nix
new file mode 100644
index 0000000000..12e8c03b17
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-literals.nix
@@ -0,0 +1,11 @@
+# tests serialisation of literal data
+builtins.toJSON [
+  42
+  "hello"
+  13.37
+  [ ]
+  [ 1 2 3 ]
+  { }
+  { name = "foo"; value = 42; }
+  { foo = 42; }
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.exp
new file mode 100644
index 0000000000..69667de5a1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.exp
@@ -0,0 +1 @@
+"{\"a\":40,\"b\":2}"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.nix
new file mode 100644
index 0000000000..70755c8c6d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath-nested.nix
@@ -0,0 +1,8 @@
+# Attribute sets with an `outPath` can contain _any_ serialisable
+# value in that field.
+builtins.toJSON {
+  outPath = {
+    a = 40;
+    b = 2;
+  };
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.exp
new file mode 100644
index 0000000000..82dd081798
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.exp
@@ -0,0 +1 @@
+"\"/nix/store/jzka5ndnygkkfjfvpqwjipqp75lhz138-emacs-28.2\""
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.nix
new file mode 100644
index 0000000000..7f9d95ac60
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-outpath.nix
@@ -0,0 +1,5 @@
+# Attribute sets with an `outPath` have that outPath itself serialised
+# to string.
+builtins.toJSON {
+  outPath = "/nix/store/jzka5ndnygkkfjfvpqwjipqp75lhz138-emacs-28.2";
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.exp
new file mode 100644
index 0000000000..9ccd94224b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.exp
@@ -0,0 +1 @@
+"[42,42,\"42\"]"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.nix
new file mode 100644
index 0000000000..16234ab451
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-thunks.nix
@@ -0,0 +1,9 @@
+let
+  a = b * 2;
+  b = 21;
+in
+builtins.toJSON [
+  a
+  ((n: n * 2) 21)
+  (builtins.toJSON a)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.exp
new file mode 100644
index 0000000000..2661fd257b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.exp
@@ -0,0 +1 @@
+"\"it's 42\""
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.nix
new file mode 100644
index 0000000000..ec6f8d947c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-tojson-tostring.nix
@@ -0,0 +1,8 @@
+# Attribute sets with a `__toString` attribute JSON-serialise with a
+# string coercion of the function call result.
+
+builtins.toJSON {
+  __toString = self: "it's " + (builtins.toString (self.x * self.y));
+  x = 21;
+  y = 2;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.exp
new file mode 100644
index 0000000000..41f22d3ee4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false true true false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.nix
new file mode 100644
index 0000000000..4b70609bbf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of-propagate-catchable.nix
@@ -0,0 +1,9 @@
+map (e: (builtins.tryEval (builtins.typeOf e)).success) [
+  (builtins.throw "a")
+  {
+    a = builtins.throw "b";
+  }
+  [ (builtins.throw "c") ]
+  (./xyz + (builtins.throw "p"))
+  # FIXME: test derivations and files.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.exp
index 0e22da8d56..1ea054fc2d 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.exp
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.exp
@@ -1 +1 @@
-[ "null" "bool" "bool" "int" "int" "float" "string" "string" "set" "set" "set" "list" "lambda" "path" ]
+[ "null" "bool" "bool" "int" "int" "float" "string" "string" "set" "set" "list" "lambda" "path" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.nix
index 38d7ffee61..fa42c6008e 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-of.nix
@@ -3,20 +3,20 @@ let
 in
 
 fix (self:
-  [
-    (builtins.typeOf null)
-    (builtins.typeOf true)
-    (builtins.typeOf (true && false))
-    (builtins.typeOf 12)
-    (builtins.typeOf (builtins.add 21 21))
-    (builtins.typeOf 1.2)
-    (builtins.typeOf "foo")
-    (builtins.typeOf "${"foo" + "bar"}baz")
-    (builtins.typeOf {})
-    (builtins.typeOf { foo.bar = 32; }.foo)
-    (builtins.typeOf ({ name = "foo"; value = 13; } // { name = "bar"; }))
-    (builtins.typeOf self)
-    (builtins.typeOf fix)
-    (builtins.typeOf /nix/store)
-  ]
+[
+  (builtins.typeOf null)
+  (builtins.typeOf true)
+  (builtins.typeOf (true && false))
+  (builtins.typeOf 12)
+  (builtins.typeOf (builtins.add 21 21))
+  (builtins.typeOf 1.2)
+  (builtins.typeOf "foo")
+  (builtins.typeOf "${"foo" + "bar"}baz")
+  (builtins.typeOf { })
+  # (builtins.typeOf { foo.bar = 32; }.foo) # TODO: re-enable when nested keys are done
+  (builtins.typeOf ({ name = "foo"; value = 13; } // { name = "bar"; }))
+  (builtins.typeOf self)
+  (builtins.typeOf fix)
+  (builtins.typeOf /nix/store)
+]
 )
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix
index 3d688cb8bd..e67b219159 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-type-predicates.nix
@@ -14,13 +14,13 @@ in
   (builtins.isFloat 1)
   (builtins.isFunction thunk)
   (builtins.isFunction (thunk thunk))
-  (builtins.isFunction {})
+  (builtins.isFunction { })
   (builtins.isInt 1)
   (builtins.isInt (thunk 42))
   (builtins.isInt 1.0)
   (builtins.isList [ (throw "oh no") (abort "it's over") ])
   (builtins.isList (thunk [ 21 21 ]))
-  (builtins.isList (thunk {}))
+  (builtins.isList (thunk { }))
   (builtins.isNull null)
   (builtins.isNull (thunk null))
   (builtins.isNull 42)
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.exp
new file mode 100644
index 0000000000..d181ebcff6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.exp
@@ -0,0 +1 @@
+[ false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.nix
new file mode 100644
index 0000000000..8ef5f35a17
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-unsafe-discard-string-context-propagate-catchable.nix
@@ -0,0 +1,4 @@
+map (e: (builtins.tryEval (builtins.unsafeDiscardStringContext e)).success) [
+  (builtins.throw "a")
+  # FIXME: test derivations with throwables.
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.nix
new file mode 100644
index 0000000000..7c2132b502
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-double-throw.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.throw (builtins.throw "a"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.nix
new file mode 100644
index 0000000000..75531d56a3
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-attrNames.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.attrNames (throw "fred"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.nix
new file mode 100644
index 0000000000..93836bd8fe
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-inequality.nix
@@ -0,0 +1 @@
+(builtins.tryEval (throw "bob" != 3)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.nix
new file mode 100644
index 0000000000..a06a383342
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-intersectattrs.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.intersectAttrs (throw "fred") { })).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.nix
new file mode 100644
index 0000000000..7a0cf16709
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-string-interpolation.nix
@@ -0,0 +1 @@
+(builtins.tryEval ("${toString 3}  ${throw "bob"}")).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.nix
new file mode 100644
index 0000000000..38a9169034
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-in-update-attrs.nix
@@ -0,0 +1 @@
+(builtins.tryEval (throw "bob" // { })).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.nix
new file mode 100644
index 0000000000..df6726db76
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-catchable-passed-to-function-with-formals.nix
@@ -0,0 +1 @@
+(builtins.tryEval (({ fred }: "bob") (throw "3"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.exp
new file mode 100644
index 0000000000..dffbbe59f0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.exp
@@ -0,0 +1 @@
+[ 4 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.nix
new file mode 100644
index 0000000000..5835bf829b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-ceil.nix
@@ -0,0 +1 @@
+[ (builtins.ceil 3.4) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.exp
new file mode 100644
index 0000000000..c3bb809c9f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.exp
@@ -0,0 +1 @@
+[ false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.nix
new file mode 100644
index 0000000000..639191be5d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-pointer-compare.nix
@@ -0,0 +1,14 @@
+# For an explanation of this behavior see //tvix/docs/value-pointer-equality.md
+let
+  g = x:
+    owo: "th" + x;
+in
+[
+  (
+    { q = g "ia"; } == { q = g ("i" + "a"); }
+  )
+
+  (
+    [ (g "ia") ] == [ (g ("i" + "a")) ]
+  )
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-self.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-self.nix
index bda364f429..7be6660009 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-self.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-self.nix
@@ -1,4 +1,5 @@
 let
   # self-recursive function should be able to close over itself
   f = n: if n <= 0 then "done" else f (n - 1);
-in f 10
+in
+f 10
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-with-shadowing.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-with-shadowing.nix
index 3054637752..2c4de65e76 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-closure-with-shadowing.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-closure-with-shadowing.nix
@@ -8,7 +8,7 @@ let
 in
 
 # introduce some closure depth to force both kinds of upvalue
-# resolution, and introduce a dynamically known `a` within the
-# closures
+  # resolution, and introduce a dynamically known `a` within the
+  # closures
 let f = b: with { a = 2; }; c: a + b + c;
 in f 0 0
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.exp
new file mode 100644
index 0000000000..d874518a37
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.exp
@@ -0,0 +1 @@
+[ "lordnikon" "zerocool" /tmp/31337h4x0r "fooblah" "blahfoo" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.nix
new file mode 100644
index 0000000000..e79e521f8a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-coerce-opadd.nix
@@ -0,0 +1,7 @@
+[
+  ({ __toString = _: "lord"; } + "nikon")
+  ("zero" + { __toString = _: "cool"; })
+  (/tmp/31337 + "h4x0r")
+  ("foo" + { outPath = "blah"; })
+  ({ outPath = "blah"; } + "foo")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.exp
new file mode 100644
index 0000000000..3b7fd39819
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.exp
@@ -0,0 +1 @@
+[ false true true true false true false false false true false false false true true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.nix
new file mode 100644
index 0000000000..1837f4d820
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-lists.nix
@@ -0,0 +1,17 @@
+[
+  ([ 1 2 ] < [ 1 ])
+  ([ 1 2 ] < [ 2 3 ])
+  ([ 1 2 ] < [ 2 ])
+  ([ 1 2 ] < [ 1 2 3 ])
+  ([ 3 4 ] < [ 1 ])
+  ([ 1 2 ] > [ 1 ])
+  ([ 1 2 ] > [ 2 3 ])
+  ([ 1 2 ] > [ 2 ])
+  ([ 1 2 ] > [ 1 2 3 ])
+  ([ 3 4 ] > [ 1 ])
+  ([ 1 2 ] <= [ 1 ])
+  ([ 1 2 ] >= [ 2 3 ])
+  ([ 1 2 ] >= [ 2 ])
+  ([ 1 2 ] <= [ 1 2 3 ])
+  ([ 3 4 ] >= [ 1 ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.nix
new file mode 100644
index 0000000000..9000160e57
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-compare-ordering-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval ((throw "x") < 3)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.exp
new file mode 100644
index 0000000000..14d804aa22
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.exp
@@ -0,0 +1 @@
+[ "a" "z" "b" "z" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.nix
new file mode 100644
index 0000000000..cff39b05e6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-concatmap.nix
@@ -0,0 +1 @@
+(builtins.concatMap (x: [ x ] ++ [ "z" ]) [ "a" "b" ])
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.exp
new file mode 100644
index 0000000000..93987647ff
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.exp
@@ -0,0 +1 @@
+[ "" "foobarxyzzy" "foo, bar, xyzzy" "foo" "" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.nix
new file mode 100644
index 0000000000..cd94ca99b4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-concatstringssep.nix
@@ -0,0 +1,9 @@
+with builtins;
+
+[
+  (concatStringsSep "" [ ])
+  (concatStringsSep "" [ "foo" "bar" "xyzzy" ])
+  (concatStringsSep ", " [ "foo" "bar" "xyzzy" ])
+  (concatStringsSep ", " [ "foo" ])
+  (concatStringsSep ", " [ ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deeply-nested-with-closure.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-deeply-nested-with-closure.nix
index 7f13f1f270..f65e8ee537 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-deeply-nested-with-closure.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deeply-nested-with-closure.nix
@@ -15,4 +15,7 @@ with { c = 3; d = 3; };
 _:
 with { d = 4; };
 
-[ a b c d ]) null null null null
+[ a b c d ]) null
+  null
+  null
+  null
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.exp
new file mode 100644
index 0000000000..8d38505c16
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.exp
@@ -0,0 +1 @@
+456
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.nix
new file mode 100644
index 0000000000..53aa4b1dc2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deepseq.nix
@@ -0,0 +1 @@
+builtins.deepSeq (let as = { x = 123; y = as; }; in as) 456
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp
new file mode 100644
index 0000000000..5993db7ccc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp
@@ -0,0 +1 @@
+[ false -2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix
new file mode 100644
index 0000000000..1fbb3e853a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix
@@ -0,0 +1,6 @@
+# Application of unary operators on deferred formals arguments (via
+# defaulting), see also b/255.
+[
+  (({ b ? !a, a }: b) { a = true; })
+  (({ b ? -a, a }: b) { a = 2; })
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-with.nix
index af227ae28e..ccafdf74ce 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-with.nix
@@ -5,4 +5,5 @@ let
   set = {
     value = 42;
   };
-in result
+in
+result
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.exp
new file mode 100644
index 0000000000..ff464e4c30
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.exp
@@ -0,0 +1 @@
+[ /foo "." "foo//" "foo" "." "." / "/" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.nix
new file mode 100644
index 0000000000..13cf473205
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-dirof.nix
@@ -0,0 +1,10 @@
+[
+  (builtins.dirOf /foo/bar)
+  (builtins.dirOf "foo")
+  (builtins.dirOf "foo///")
+  (builtins.dirOf "foo/bar")
+  (builtins.dirOf "./.")
+  (builtins.dirOf "")
+  (builtins.dirOf /.)
+  (builtins.toString (builtins.dirOf /.))
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-elem.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-elem.exp
new file mode 100644
index 0000000000..3cf6c0e962
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-elem.exp
@@ -0,0 +1 @@
+[ true false 30 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-elem.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-elem.nix
new file mode 100644
index 0000000000..71ea7a4ed0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-elem.nix
@@ -0,0 +1,6 @@
+with import ./lib.nix;
+
+let xs = range 10 40; in
+
+[ (builtins.elem 23 xs) (builtins.elem 42 xs) (builtins.elemAt xs 20) ]
+
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.exp
new file mode 100644
index 0000000000..27ba77ddaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.exp
@@ -0,0 +1 @@
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.nix
new file mode 100644
index 0000000000..cc39e2415f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-eq-nested-list.nix
@@ -0,0 +1 @@
+[ [ "f" "" ] ] == [ [ "f" "" ] ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.nix
new file mode 100644
index 0000000000..6bd018b68d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-equality-tolerate-catchable-in-type-field.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.elem { type = rec { x = throw "fred"; }.x; } [{ type = 3; }])).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.exp
new file mode 100644
index 0000000000..d889063f9a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.exp
@@ -0,0 +1 @@
+"💭(\":thonking:\")"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.nix
new file mode 100644
index 0000000000..49f4b62731
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-escape-string-correct-char-boundaries.nix
@@ -0,0 +1,6 @@
+# Regression test for a bug where tvix would crash in nix_escape_string
+# because it counted the string position by unicode code point count,
+# but then used it as a byte index for slicing. Consequently, it would
+# try slicing 💭 in half, thinking the first element to be escaped was
+# at byte index 2 (i.e. the quote).
+"💭(\":thonking:\")"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.exp
new file mode 100644
index 0000000000..aa98a082a8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.exp
@@ -0,0 +1 @@
+{ "3" = 3; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.nix
new file mode 100644
index 0000000000..aa98a082a8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-escapify-integer-keys.nix
@@ -0,0 +1 @@
+{ "3" = 3; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix
index 9a22d85ac5..04cb52e033 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fib.nix
@@ -1,7 +1,9 @@
 let
-  fib' = i: n: m: if i == 0
+  fib' = i: n: m:
+    if i == 0
     then n
     else fib' (i - 1) m (n + m);
 
   fib = n: fib' n 1 1;
-in fib 10
+in
+fib 10
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fix.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-fix.nix
index 27d2fae104..6069950194 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-fix.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fix.nix
@@ -1,6 +1,7 @@
 let
   fix = f: let x = f x; in x;
-in fix(self: {
+in
+fix (self: {
   a = 1;
   b = self.a + 20;
   c = self.b * 2;
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-floor.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-floor.exp
new file mode 100644
index 0000000000..6f98a7f48f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-floor.exp
@@ -0,0 +1 @@
+[ 3 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-floor.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-floor.nix
new file mode 100644
index 0000000000..c6b79c91a1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-floor.nix
@@ -0,0 +1 @@
+[ (builtins.floor 3.4) ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.nix
new file mode 100644
index 0000000000..fc4129a254
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-elements.nix
@@ -0,0 +1,8 @@
+let
+  lst = builtins.foldl'
+    (acc: x: acc ++ [ x ])
+    [ ]
+    [ 42 (throw "this shouldn't be evaluated") ];
+in
+
+builtins.head lst
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
new file mode 100644
index 0000000000..59fd29b552
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict-lazy-initial-accumulator.nix
@@ -0,0 +1,4 @@
+builtins.foldl'
+  (_: x: x)
+  (throw "This is never forced")
+  [ "but the results of applying op are" 42 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.exp
new file mode 100644
index 0000000000..8d683a20fa
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.exp
@@ -0,0 +1 @@
+[ 6 [ 0 1 2 3 ] 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.nix
new file mode 100644
index 0000000000..aadf5e1121
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-foldlStrict.nix
@@ -0,0 +1,5 @@
+[
+  (builtins.foldl' builtins.add 0 [ 1 2 3 ])
+  (builtins.foldl' (l1: l2: l1 ++ l2) [ 0 ] [ [ 1 ] [ 2 3 ] ])
+  (builtins.foldl' (x: y: if x == 0 then y else x * y) 0 [ 1 2 ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.exp
new file mode 100644
index 0000000000..721a052bcc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.exp
@@ -0,0 +1 @@
+[ true null ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.nix
new file mode 100644
index 0000000000..772fa6f386
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-formals-miscompilation-b-261-regression.nix
@@ -0,0 +1,20 @@
+# This is a regression test for https://b.tvl.fyi/261.
+#
+# The bug occurred when Tvix would unconditionally finalise the stack slot of
+# `finalise` (as its default expression needs a finaliser): Finalising an
+# manually provided, already forced thunk would cause the VM to crash.
+let
+  thunk = x: x;
+  bomb = thunk true;
+  f =
+    { finalise ? later == null
+    , later ? null
+    }:
+    [ finalise later ];
+in
+
+# Note that the crash did not occur if the offending expression was the rhs
+  # argument to `builtins.seq`, hence we need to put the assert in between.
+assert builtins.seq bomb true;
+
+f { finalise = bomb; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.exp
new file mode 100644
index 0000000000..add5505a82
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.exp
@@ -0,0 +1 @@
+"quote \" reverse solidus \\ solidus / backspace  formfeed  newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace  1 char unicode encoded e with accent é 2 char unicode encoded s with caron š 3 char unicode encoded rightwards arrow →"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.nix
new file mode 100644
index 0000000000..f007135077
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson-escapes.nix
@@ -0,0 +1,3 @@
+# This string contains all supported escapes in a JSON string, per json.org
+# \b and \f are not supported by Nix
+builtins.fromJSON ''"quote \" reverse solidus \\ solidus \/ backspace \b formfeed \f newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace \u0008 1 char unicode encoded e with accent \u00e9 2 char unicode encoded s with caron \u0161 3 char unicode encoded rightwards arrow \u2192"''
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.exp
new file mode 100644
index 0000000000..24aa21d78f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.exp
@@ -0,0 +1 @@
+[ { Image = { Animated = false; Height = 600; IDs = [ 116 943 234 38793 true false null -100 ]; Latitude = 37.7668; Longitude = -122.396; Thumbnail = { Height = 125; Url = "http://www.example.com/image/481989943"; Width = 100; }; Title = "View from 15th Floor"; Width = 800; }; } { name = "a"; value = "b"; } [ 1 2 3 4 ] ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.nix
new file mode 100644
index 0000000000..1083919af8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-fromjson.nix
@@ -0,0 +1,24 @@
+[
+  # RFC 7159, section 13.
+  (builtins.fromJSON
+    ''
+      {
+        "Image": {
+            "Width":  800,
+            "Height": 600,
+            "Title":  "View from 15th Floor",
+            "Thumbnail": {
+                "Url":    "http://www.example.com/image/481989943",
+                "Height": 125,
+                "Width":  100
+            },
+            "Animated" : false,
+            "IDs": [116, 943, 234, 38793, true  ,false,null, -100],
+            "Latitude":  37.7668,
+            "Longitude": -122.396
+        }
+      }
+    '')
+  (builtins.fromJSON ''{"name": "a", "value": "b"}'')
+  (builtins.fromJSON "[ 1, 2, 3, 4 ]")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.exp
new file mode 100644
index 0000000000..c1c9f8ffaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.exp
@@ -0,0 +1 @@
+[ "stdenv" "fetchurl" "aterm-stdenv" "aterm-stdenv2" "libX11" "libXv" "mplayer-stdenv2.libXv-libX11" "mplayer-stdenv2.libXv-libX11_2" "nix-stdenv-aterm-stdenv" "nix-stdenv2-aterm2-stdenv2" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.nix
new file mode 100644
index 0000000000..6db04c562c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-functionargs.nix
@@ -0,0 +1,83 @@
+let
+
+  stdenvFun = {}: { name = "stdenv"; };
+  stdenv2Fun = {}: { name = "stdenv2"; };
+  fetchurlFun = { stdenv }: assert stdenv.name == "stdenv"; { name = "fetchurl"; };
+  atermFun = { stdenv, fetchurl }: { name = "aterm-${stdenv.name}"; };
+  aterm2Fun = { stdenv, fetchurl }: { name = "aterm2-${stdenv.name}"; };
+  nixFun = { stdenv, fetchurl, aterm }: { name = "nix-${stdenv.name}-${aterm.name}"; };
+
+  mplayerFun =
+    { stdenv, fetchurl, enableX11 ? false, xorg ? null, enableFoo ? true, foo ? null }:
+      assert stdenv.name == "stdenv2";
+      assert enableX11 -> xorg.libXv.name == "libXv";
+      assert enableFoo -> foo != null;
+      { name = "mplayer-${stdenv.name}.${xorg.libXv.name}-${xorg.libX11.name}"; };
+
+  makeOverridable = f: origArgs: f origArgs //
+    {
+      override = newArgs:
+        makeOverridable f (origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs));
+    };
+
+  callPackage_ = pkgs: f: args:
+    makeOverridable f ((builtins.intersectAttrs (builtins.functionArgs f) pkgs) // args);
+
+  allPackages =
+    { overrides ? (pkgs: pkgsPrev: { }) }:
+    let
+      callPackage = callPackage_ pkgs;
+      pkgs = pkgsStd // (overrides pkgs pkgsStd);
+      pkgsStd = {
+        inherit pkgs;
+        stdenv = callPackage stdenvFun { };
+        stdenv2 = callPackage stdenv2Fun { };
+        fetchurl = callPackage fetchurlFun { };
+        aterm = callPackage atermFun { };
+        xorg = callPackage xorgFun { };
+        mplayer = callPackage mplayerFun { stdenv = pkgs.stdenv2; enableFoo = false; };
+        nix = callPackage nixFun { };
+      };
+    in
+    pkgs;
+
+  libX11Fun = { stdenv, fetchurl }: { name = "libX11"; };
+  libX11_2Fun = { stdenv, fetchurl }: { name = "libX11_2"; };
+  libXvFun = { stdenv, fetchurl, libX11 }: { name = "libXv"; };
+
+  xorgFun =
+    { pkgs }:
+    let callPackage = callPackage_ (pkgs // pkgs.xorg); in
+    {
+      libX11 = callPackage libX11Fun { };
+      libXv = callPackage libXvFun { };
+    };
+
+in
+
+let
+
+  pkgs = allPackages { };
+
+  pkgs2 = allPackages {
+    overrides = pkgs: pkgsPrev: {
+      stdenv = pkgs.stdenv2;
+      nix = pkgsPrev.nix.override { aterm = aterm2Fun { inherit (pkgs) stdenv fetchurl; }; };
+      xorg = pkgsPrev.xorg // { libX11 = libX11_2Fun { inherit (pkgs) stdenv fetchurl; }; };
+    };
+  };
+
+in
+
+[
+  pkgs.stdenv.name
+  pkgs.fetchurl.name
+  pkgs.aterm.name
+  pkgs2.aterm.name
+  pkgs.xorg.libX11.name
+  pkgs.xorg.libXv.name
+  pkgs.mplayer.name
+  pkgs2.mplayer.name
+  pkgs.nix.name
+  pkgs2.nix.name
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.nix
new file mode 100644
index 0000000000..80ae345d83
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-functor-call.nix
@@ -0,0 +1 @@
+{ x = 21; __functor = self: y: self.x * y; } 2
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.exp
new file mode 100644
index 0000000000..cd4ca34f14
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.exp
@@ -0,0 +1 @@
+[ 0 1 4 9 16 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.nix
new file mode 100644
index 0000000000..2c4dfba203
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-genlist.nix
@@ -0,0 +1 @@
+builtins.genList (x: x * x) 5
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.nix
new file mode 100644
index 0000000000..ba85d6b776
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-hasattr-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval ((throw "fred") ? bob)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.exp
new file mode 100644
index 0000000000..9800c675fc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.exp
@@ -0,0 +1 @@
+{ "'quoted'" = false; "-20°" = false; "2normal" = false; "45 44 43-'3 2 1" = false; "9front" = false; Very2Normal = true; VeryNormal = true; _'12 = true; "_'12.5" = false; __internal = true; _internal = true; abort = true; "assert" = false; "attr.path" = false; "else" = false; false = true; foldl' = true; "if" = false; "in" = false; "inherit" = false; "let" = false; normal = true; normal2 = true; null = true; or = true; "rec" = false; "then" = false; throw = true; true = true; "with" = false; x = true; x' = true; x'' = true; "😀" = false; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.nix
new file mode 100644
index 0000000000..58af3d6d16
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-identifier-formatting.nix
@@ -0,0 +1,42 @@
+# Note: the attribute values in this set aren't just dummies!  They
+# are booleans which indicate whether or not the corresponding
+# attrname is valid without quotification.
+{
+  __internal = true;
+  _internal = true;
+  normal = true;
+  VeryNormal = true;
+  normal2 = true;
+  Very2Normal = true;
+  _'12 = true;
+  foldl' = true;
+  x = true;
+  x' = true;
+  x'' = true;
+
+  true = true;
+  false = true;
+  null = true;
+  or = true;
+  "assert" = false;
+  throw = true;
+  abort = true;
+
+  "9front" = false;
+  "2normal" = false;
+  "-20°" = false;
+  "45 44 43-'3 2 1" = false;
+  "attr.path" = false;
+  "'quoted'" = false;
+  "_'12.5" = false;
+  "😀" = false;
+
+  "if" = false;
+  "then" = false;
+  "else" = false;
+  "with" = false;
+  "let" = false;
+  "in" = false;
+  "rec" = false;
+  "inherit" = false;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.exp
new file mode 100644
index 0000000000..15d838950e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.exp
@@ -0,0 +1 @@
+<PRIMOP>
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.nix
new file mode 100644
index 0000000000..411f3cd6ef
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-import-display.nix
@@ -0,0 +1,2 @@
+# In C++ Nix 2.3 this used to be <PRIMOP-APP>
+import
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-import.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-import.exp
new file mode 100644
index 0000000000..5ba7f64d78
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-import.exp
@@ -0,0 +1 @@
+[ 42 42 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-import.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-import.nix
new file mode 100644
index 0000000000..49cd244f06
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-import.nix
@@ -0,0 +1,4 @@
+[
+  (import ./directory)
+  (import ./directory/default.nix)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-inherit-string-ident.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-inherit-string-ident.nix
index dde81e5a7c..75794d3337 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-inherit-string-ident.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-inherit-string-ident.nix
@@ -4,4 +4,5 @@ let
   set = {
     inherit ({ value = 42; }) "value";
   };
-in set.value
+in
+set.value
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.nix
new file mode 100644
index 0000000000..5c6702120f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals-deferred.nix
@@ -0,0 +1,3 @@
+# Tests formals which have internal default values that must be deferred.
+
+({ optional ? defaultValue, defaultValue }: optional) { defaultValue = 42; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.nix
new file mode 100644
index 0000000000..c6dd5e9d54
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-internal-formals.nix
@@ -0,0 +1,3 @@
+# Tests formals which have internal default values.
+
+({ defaultValue, optional ? defaultValue }: optional) { defaultValue = 42; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.exp
new file mode 100644
index 0000000000..25001b211f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.exp
@@ -0,0 +1 @@
+{ a = 100; b = 200; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.nix
new file mode 100644
index 0000000000..f02d963226
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-intersectattrs.nix
@@ -0,0 +1,3 @@
+builtins.intersectAttrs
+{ a = 1; b = 2; c = 3; }
+{ a = 100; b = 200; d = 5; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding-closure.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding-closure.nix
index dae170b06b..4312ec9a52 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding-closure.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding-closure.nix
@@ -1,4 +1,5 @@
 let
   f = n: n + a;
   a = 2;
-in f 40
+in
+f 40
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding.nix
index 41c4c53ea2..6b6875cf1a 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-late-binding.nix
@@ -1,4 +1,5 @@
 let
   a = b;
   b = 42;
-in a
+in
+a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.exp
index e6f2d1aaad..1c70d1bcf1 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.exp
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.exp
@@ -1 +1 @@
-[ true true false ]
+[ true true false true true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.nix
index b0ec8593a4..92363245f8 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-equality.nix
@@ -4,8 +4,13 @@ let
   list1 = [ (1 + 2) ];
   list2 = [ (2 + 1) ];
   list3 = [ (2 + 2) ];
-in [
+  list4 = [ (2 + 2) ];
+  list5 = [ (2 + 2) ];
+in
+[
   (attrs1 == attrs2)
   (list1 == list2)
   (list3 == list2)
+  (list4 == [ 4 ])
+  ([ 4 ] == list5)
 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.nix
new file mode 100644
index 0000000000..22ac14b3f1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with-nested.nix
@@ -0,0 +1,5 @@
+# The 'namespace' of a with should only be evaluated if an identifier
+# from it is actually accessed.
+
+with (abort "should not be evaluated");
+let a = dynamic; in 42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with.nix
index e4377df97e..8b1a0191dc 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-lazy-with.nix
@@ -1,6 +1,6 @@
 # The 'namespace' of a with should only be evaluated if an identifier
 # from it is actually accessed.
 
-with (builtins.throw "should not occur");
+with (abort "should not be evaluated");
 
 42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-fix.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-fix.nix
index 87fcffadee..a411b1c4a4 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-fix.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-fix.nix
@@ -1,9 +1,9 @@
 let {
-  a = 21;
-  b = body.one;
+a = 21;
+b = body.one;
 
-  body = {
-    one = a * 2;
-    two = b;
-  };
+body = {
+  one = a * 2;
+  two = b;
+};
 }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.nix
new file mode 100644
index 0000000000..7d95efa5c3
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let-in-with.nix
@@ -0,0 +1 @@
+with { }; let { body = 42; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let.nix
index 850e0252c2..faabe25457 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-legacy-let.nix
@@ -1,4 +1,4 @@
 let {
-  a = 21;
-  body = a * 2;
+a = 21;
+body = a * 2;
 }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-let-identifiers.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-let-identifiers.nix
index b6c37c34f9..ce588be069 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-let-identifiers.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-let-identifiers.nix
@@ -2,4 +2,5 @@ let
   a = 1;
   "b" = 2;
   ${"c"} = 3;
-in [ a b c ]
+in
+[ a b c ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-let-inherit.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-let-inherit.nix
index 4ec270e3bf..3aa7c0f8d2 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-let-inherit.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-let-inherit.nix
@@ -3,10 +3,11 @@ let
     a = 1;
   };
 in
-  let
-    set2 = {
-      b = 1;
-    };
-    inherit (set) a;
-    inherit (set2) b;
-  in a + b
+let
+  set2 = {
+    b = 1;
+  };
+  inherit (set) a;
+  inherit (set2) b;
+in
+a + b
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-let-sibling-access.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-let-sibling-access.nix
index 7a65a5b1cc..faad81a213 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-let-sibling-access.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-let-sibling-access.nix
@@ -2,4 +2,5 @@ let
   a = 1;
   b = 2;
   c = a + b;
-in c
+in
+c
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.nix
new file mode 100644
index 0000000000..7796fe4cbb
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-list-comparison.nix
@@ -0,0 +1 @@
+[ 1 2 ] > [ ((rec{ x = 1; }).x) 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.exp
new file mode 100644
index 0000000000..74abef7bc6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.exp
@@ -0,0 +1 @@
+"AAbar"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.nix
new file mode 100644
index 0000000000..551db72cb0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-listtoattrs.nix
@@ -0,0 +1,16 @@
+with builtins;
+let
+  fold = op: nul: list:
+    if list == [ ]
+    then nul
+    else op (head list) (fold op nul (tail list));
+  concat =
+    fold (x: y: x + y) "";
+  asi = name: value: { inherit name value; };
+  list = [ (asi "a" "A") (asi "b" "B") ];
+  a = builtins.listToAttrs list;
+  b = builtins.listToAttrs (list ++ list);
+  r = builtins.listToAttrs [ (asi "result" [ a b ]) (asi "throw" (throw "this should not be thrown")) ];
+  x = builtins.listToAttrs [ (asi "foo" "bar") (asi "foo" "bla") ];
+in
+concat (map (x: x.a) r.result) + x.foo
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.nix
new file mode 100644
index 0000000000..dd2a9baa75
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-and-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval ((throw "fred") && (throw "jill"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.nix
new file mode 100644
index 0000000000..3adccfa441
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-logical-or-catchable.nix
@@ -0,0 +1 @@
+(builtins.tryEval ((throw "fred") || (throw "jill"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-manual-rec.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-manual-rec.nix
index 8e1256d764..23459e384a 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-manual-rec.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-manual-rec.nix
@@ -6,4 +6,5 @@ let
     a = 21;
     b = a * 2;
   };
-in set.b
+in
+set.b
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.exp
new file mode 100644
index 0000000000..911ab51de5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.exp
@@ -0,0 +1 @@
+{ set = { a = 1; b = 2; }; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.nix
new file mode 100644
index 0000000000..78b28909a2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-attrs.nix
@@ -0,0 +1,9 @@
+{
+  set = {
+    a = 1;
+  };
+
+  set = {
+    b = 2;
+  };
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.exp
new file mode 100644
index 0000000000..768eaae61c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.exp
@@ -0,0 +1 @@
+{ set = { a = 21; b = 42; }; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.nix
new file mode 100644
index 0000000000..cea4cb1b4f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-merge-nested-rec-attrs.nix
@@ -0,0 +1,12 @@
+{
+  set = rec {
+    a = 21;
+  };
+
+  set = {
+    # Fun fact: This might be the only case in Nix where a lexical
+    # resolution of an identifier can only be resolved by looking at
+    # *siblings* in the AST.
+    b = 2 * a;
+  };
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.nix
new file mode 100644
index 0000000000..b0397e268e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-assertions.nix
@@ -0,0 +1 @@
+(builtins.tryEval (assert (assert false; true); true)).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-deferred-upvalue.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-deferred-upvalue.nix
index 358925e992..3fa1d3ed05 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-deferred-upvalue.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-deferred-upvalue.nix
@@ -1,6 +1,10 @@
 let
   doubler = n: outer n;
-  outer = let inner = n: a * n;
-            a = 2;
-          in inner;
-in doubler 10
+  outer =
+    let
+      inner = n: a * n;
+      a = 2;
+    in
+    inner;
+in
+doubler 10
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.exp
new file mode 100644
index 0000000000..6db47b033e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.exp
@@ -0,0 +1 @@
+{ a = { b = 42; }; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.nix
new file mode 100644
index 0000000000..c99ac748e6
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-let.nix
@@ -0,0 +1,5 @@
+let
+  inner = 21;
+  set.a.b = inner * 2;
+in
+set
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.exp
new file mode 100644
index 0000000000..77eb325dde
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.exp
@@ -0,0 +1 @@
+{ a = { b = { c = 42; }; }; outer = 21; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.nix
new file mode 100644
index 0000000000..797d11108f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-keys-rec.nix
@@ -0,0 +1,4 @@
+rec {
+  outer = 21;
+  a.b.c = outer * 2;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let-slots.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let-slots.nix
index 811bb4361b..eec5940875 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let-slots.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let-slots.nix
@@ -6,12 +6,17 @@
 let
   a = 1;
   b = 2;
-  outer = let
-    c = 3;
-    d = 4;
-    inner = let
-      e = 5;
-      f = 6;
-    in g: [ a b c d e f g ];
-  in inner;
-in outer 7
+  outer =
+    let
+      c = 3;
+      d = 4;
+      inner =
+        let
+          e = 5;
+          f = 6;
+        in
+        g: [ a b c d e f g ];
+    in
+    inner;
+in
+outer 7
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let.nix
index caaa202119..f40c04b139 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-let.nix
@@ -1,7 +1,10 @@
 let
-  a = let
-    b = 1;
-    c = 2;
-  in b + c;
+  a =
+    let
+      b = 1;
+      c = 2;
+    in
+    b + c;
   b = 4;
-in a + b
+in
+a + b
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-poisoning.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-poisoning.nix
index 8d0280bb89..0fd22a671c 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-poisoning.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-poisoning.nix
@@ -1,4 +1,5 @@
 let
   null = 1;
   f = n: n + null;
-in f 41
+in
+f 41
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.exp
new file mode 100644
index 0000000000..d757cae1f5
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.exp
@@ -0,0 +1 @@
+{ outer = 42; sibling = 42; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.nix
new file mode 100644
index 0000000000..31111d8081
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-siblings.nix
@@ -0,0 +1,7 @@
+rec {
+  outer =
+    let inner = sibling;
+    in inner;
+
+  sibling = 42;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-thunks.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-thunks.nix
index 133929dd19..2519221e97 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-thunks.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-thunks.nix
@@ -4,4 +4,5 @@ let
   a = b;
   b = c;
   c = 42;
-in a
+in
+a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-with.nix
index ea5ef568ed..fa832b2099 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-nested-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nested-with.nix
@@ -1,4 +1,5 @@
 let
   set1 = { a = 1; };
   set2 = { a = 2; };
-in with set1; with set2; a
+in
+with set1; with set2; a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.exp
new file mode 100644
index 0000000000..3a2e3f4984
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.exp
@@ -0,0 +1 @@
+-1
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.nix
new file mode 100644
index 0000000000..6f35305612
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-nix-version-cmp.nix
@@ -0,0 +1,5 @@
+# nixpkgs checks against the `builtins.nixVersion` and fails if it
+# doesn't like what it sees. To work around this we have a "user-agent
+# style" version (see cl/6858) that ensures compatibility.
+
+builtins.compareVersions "2.3" builtins.nixVersion
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.exp
new file mode 100644
index 0000000000..aaa53b6025
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.exp
@@ -0,0 +1 @@
+[ true true false false true ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.nix
new file mode 100644
index 0000000000..24003d0637
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-observable-eval-cache.nix
@@ -0,0 +1,7 @@
+[
+  (import ./observable-eval-cache1.nix == import ./observable-eval-cache1.nix)
+  (import ./observable-eval-cache1.nix == import ./observable-eval-cache2.nix)
+  (import ./observable-eval-cache1.nix == import ./observable-eval-cache3.nix)
+  (import ./observable-eval-cache2.nix == import ./observable-eval-cache3.nix)
+  (import ./observable-eval-cache3.nix == import ./observable-eval-cache3.nix)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.exp
new file mode 100644
index 0000000000..bbb332a5ee
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.exp
@@ -0,0 +1 @@
+[ "x" "y" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.nix
new file mode 100644
index 0000000000..684c88f800
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-observe-infinite-attrs.nix
@@ -0,0 +1,4 @@
+# The below attribute set is infinitely large, but we should be able
+# to observe it as long as we don't access its entire value.
+
+let as = { x = 123; y = as; }; in builtins.attrNames as.y.y
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.exp
new file mode 100644
index 0000000000..9d9185fcd1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.exp
@@ -0,0 +1 @@
+[ true true false false true true false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.nix
new file mode 100644
index 0000000000..650d7f028d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-optimised-bools.nix
@@ -0,0 +1,21 @@
+let
+  makeTrue = _: true;
+  makeFalse = _: false;
+in
+[
+  # useless `false`
+  (false || makeTrue null) # true
+  (makeTrue null || false) # true
+
+  # useless `true`
+  (true && makeFalse null) # false
+  (makeFalse null && true) # false
+
+  # useless `||`
+  (true || makeFalse null) # true
+  (makeFalse null || true) # true
+
+  # useless `&&`
+  (false && makeTrue null) # false
+  (makeTrue null && false) # false
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.exp
new file mode 100644
index 0000000000..27ba77ddaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.exp
@@ -0,0 +1 @@
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.nix
new file mode 100644
index 0000000000..5997c99b47
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-parsedrvname.nix
@@ -0,0 +1,11 @@
+# the first dash followed by a non-alphabetic character separates
+# the "name" from the "version"
+
+assert builtins.parseDrvName "ripgrep-1.2" == { name = "ripgrep"; version = "1.2"; };
+assert builtins.parseDrvName "rip-grep-1.2" == { name = "rip-grep"; version = "1.2"; };
+assert builtins.parseDrvName "7zip_archiver-0.2" == { name = "7zip_archiver"; version = "0.2"; };
+assert builtins.parseDrvName "gcc-1-2" == { name = "gcc"; version = "1-2"; };
+assert builtins.parseDrvName "bash--1-2" == { name = "bash"; version = "-1-2"; };
+assert builtins.parseDrvName "xvidtune-?1-2" == { name = "xvidtune"; version = "?1-2"; };
+
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.exp
new file mode 100644
index 0000000000..27ba77ddaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.exp
@@ -0,0 +1 @@
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.nix
new file mode 100644
index 0000000000..c9eedb44ff
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-pathexists.nix
@@ -0,0 +1,2 @@
+builtins.pathExists ./lib.nix
+  && !builtins.pathExists ./bla.nix
diff --git a/tvix/eval/src/tests/nix_tests/eval-okay-readDir.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-readDir.exp
index bf8d2c14ea..bf8d2c14ea 100644
--- a/tvix/eval/src/tests/nix_tests/eval-okay-readDir.exp
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-readDir.exp
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-readDir.nix.disabled b/tvix/eval/src/tests/tvix_tests/eval-okay-readDir.nix.disabled
new file mode 100644
index 0000000000..a7ec9292aa
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-readDir.nix.disabled
@@ -0,0 +1 @@
+builtins.readDir ./readDir
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.exp
new file mode 100644
index 0000000000..a2c87d0c43
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.exp
@@ -0,0 +1 @@
+"builtins.readFile ./eval-okay-readfile.nix\n"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.nix
new file mode 100644
index 0000000000..82f7cb1743
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-readfile.nix
@@ -0,0 +1 @@
+builtins.readFile ./eval-okay-readfile.nix
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.exp
new file mode 100644
index 0000000000..ac8d062a69
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.exp
@@ -0,0 +1 @@
+{ barbaz = 42; foobar = 42; val = 21; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.nix
new file mode 100644
index 0000000000..8d7a8cef8e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-dynamic-keys.nix
@@ -0,0 +1,5 @@
+rec {
+  val = 21;
+  ${"foo" + "bar"} = 42;
+  ${"bar" + "baz"} = val * 2;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.exp
new file mode 100644
index 0000000000..a1dca9bb68
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.exp
@@ -0,0 +1 @@
+{ a = { b = 1; c = 2; }; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.nix
new file mode 100644
index 0000000000..7d037c6b37
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-rec-nested-access.nix
@@ -0,0 +1,4 @@
+rec {
+  a.b = 1;
+  a.c = a.b * 2;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.exp
new file mode 100644
index 0000000000..9501035391
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.exp
@@ -0,0 +1 @@
+[ true true false true true true true false false true false [ "foobar" ] [ "FOO" ] [ "/path/to/" "/path/to" "foobar" "nix" ] [ null null "foobar" "cc" ] ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.nix
new file mode 100644
index 0000000000..f774e00a21
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-regex-match.nix
@@ -0,0 +1,29 @@
+with builtins;
+
+let
+
+  matches = pat: s: match pat s != null;
+
+  splitFN = match "((.*)/)?([^/]*)\\.(nix|cc)";
+
+in
+
+[
+  (matches "foobar" "foobar")
+  (matches "fo*" "f")
+  (matches "fo+" "f")
+  (matches "fo*" "fo")
+  (matches "fo*" "foo")
+  (matches "fo+" "foo")
+  (matches "fo{1,2}" "foo")
+  (matches "fo{1,2}" "fooo")
+  (matches "fo*" "foobar")
+  (matches "[[:space:]]+([^[:space:]]+)[[:space:]]+" "  foo   ")
+  (matches "[[:space:]]+([[:upper:]]+)[[:space:]]+" "  foo   ")
+
+  (match "(.*)\\.nix" "foobar.nix")
+  (match "[[:space:]]+([[:upper:]]+)[[:space:]]+" "  FOO   ")
+
+  (splitFN "/path/to/foobar.nix")
+  (splitFN "foobar.cc")
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-remove.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-remove.exp
new file mode 100644
index 0000000000..8d38505c16
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-remove.exp
@@ -0,0 +1 @@
+456
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-remove.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-remove.nix
new file mode 100644
index 0000000000..62c5aa1fd4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-remove.nix
@@ -0,0 +1,5 @@
+let {
+attrs = { x = 123; y = 456; };
+
+body = (removeAttrs attrs [ "x" ]).y;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp
new file mode 100644
index 0000000000..b4a1e66d6b
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.exp
@@ -0,0 +1 @@
+[ 1 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix
new file mode 100644
index 0000000000..ed819d76c7
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-repeated-list-to-attrs.nix
@@ -0,0 +1,14 @@
+# Ensure that builtins.listToAttrs returns the first instance of a key.
+
+let
+  inherit (builtins) foldl' listToAttrs;
+
+  input = [{ name = "result"; value = 1; } { name = "result"; value = 2; }];
+
+  # foldl-based version of listToAttrs with the _opposite_ behaviour.
+  listToAttrs' = list: foldl' (acc: elem: acc // { ${elem.name} = elem.value; }) { } list;
+in
+[
+  (listToAttrs input).result
+  (listToAttrs' input).result
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-seq.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-seq.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-seq.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-seq.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-seq.nix
new file mode 100644
index 0000000000..fd0806c199
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-seq.nix
@@ -0,0 +1 @@
+(builtins.seq 1 2) + (builtins.seq [ (throw "list") ] 20) + (builtins.seq { boing = throw "set"; } 20)
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-simple-let.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-simple-let.nix
index b440a220ff..b4da0f824a 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-simple-let.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-simple-let.nix
@@ -1,4 +1,5 @@
 let
   a = 1;
   b = 2;
-in a + b
+in
+a + b
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-simple-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-simple-with.nix
index 64962b50ff..3d375be4f9 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-simple-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-simple-with.nix
@@ -2,4 +2,5 @@ let
   set = {
     a = 1;
   };
-in with set; a
+in
+with set; a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.exp
new file mode 100644
index 0000000000..9d78376214
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.exp
@@ -0,0 +1 @@
+[ { index = 7; key = 0; } { index = 0; key = 1; } { index = 13; key = 1; } { index = 1; key = 2; } { index = 3; key = 2; } { index = 4; key = 2; } { index = 5; key = 2; } { index = 12; key = 2; } { index = 14; key = 2; } { index = 2; key = 3; } { index = 11; key = 3; } { index = 15; key = 3; } { index = 10; key = 4; } { index = 6; key = 5; } { index = 8; key = 5; } { index = 9; key = 5; } { index = 16; key = 22; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.nix
new file mode 100644
index 0000000000..9969e0a294
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-stable-sort.nix
@@ -0,0 +1,7 @@
+let
+  keys = [ 1 2 3 2 2 2 5 0 5 5 4 3 2 1 2 3 22 ];
+in
+
+builtins.sort
+  (a: b: a.key < b.key)
+  (builtins.genList (index: { inherit index; key = builtins.elemAt keys index; }) (builtins.length keys))
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix
new file mode 100644
index 0000000000..78d5dda38e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix
@@ -0,0 +1 @@
+(builtins.tryEval (builtins.substring 0 4 (throw "jill"))).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.nix
new file mode 100644
index 0000000000..0523cf864c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-default-args.nix
@@ -0,0 +1 @@
+(builtins.tryEval (({ foo ? throw "up" }: if foo then 1 else 2) { })).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.exp
new file mode 100644
index 0000000000..c508d5366f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.nix
new file mode 100644
index 0000000000..126738d883
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-test-catchables-in-implications.nix
@@ -0,0 +1 @@
+(builtins.tryEval (({ foo ? throw "up" }: foo -> true) { })).success
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.exp
new file mode 100644
index 0000000000..d81cc0710e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.exp
@@ -0,0 +1 @@
+42
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.nix
new file mode 100644
index 0000000000..568a5c5413
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-functor.nix
@@ -0,0 +1,8 @@
+let
+  __functor = f;
+  f = self: x: self.out * x;
+in
+{
+  inherit __functor;
+  out = 21;
+} 2
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.exp
new file mode 100644
index 0000000000..ffcd4415b0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.exp
@@ -0,0 +1 @@
+{ }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.nix
new file mode 100644
index 0000000000..3810ebe784
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-if.nix
@@ -0,0 +1,8 @@
+let
+  a = { };
+in
+let
+  c = if builtins.isFunction a then a b else a;
+  b = { };
+in
+c
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-with.nix
index 6f32660c4c..799408b2e6 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-thunked-with.nix
@@ -4,4 +4,5 @@ let
   set = {
     a = with { b = 42; }; b;
   };
-in set.a
+in
+set.a
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-toplevel-finaliser.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-toplevel-finaliser.nix
index 4c6884bec3..5f25f80671 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-toplevel-finaliser.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-toplevel-finaliser.nix
@@ -5,6 +5,7 @@ let
   a = 1;
   b = 2;
   c = 3;
-in {
+in
+{
   inherit a b c;
 }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.exp.xml b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.exp.xml
new file mode 100644
index 0000000000..468972b2f8
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.exp.xml
@@ -0,0 +1,5 @@
+<?xml version='1.0' encoding='utf-8'?>
+<expr>
+  <attrs>
+  </attrs>
+</expr>
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.nix
new file mode 100644
index 0000000000..ffcd4415b0
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml-empty.nix
@@ -0,0 +1 @@
+{ }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.exp
new file mode 100644
index 0000000000..9ae16de526
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.exp
@@ -0,0 +1 @@
+"<?xml version='1.0' encoding='utf-8'?>\n<expr>\n  <attrs>\n    <attr name=\"&amp;-{\">\n      <string value=\";&amp;&quot;\" />\n    </attr>\n    <attr name=\"a\">\n      <string value=\"s\" />\n    </attr>\n  </attrs>\n</expr>\n"
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.nix
new file mode 100644
index 0000000000..7d074048dd
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-toxml.nix
@@ -0,0 +1,2 @@
+# Check some corner cases regarding escaping.
+builtins.toXML { a = "s"; "&-{" = ";&\""; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.exp
new file mode 100644
index 0000000000..b5ba0757c1
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.exp
@@ -0,0 +1 @@
+[ { success = false; value = false; } { success = false; value = false; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.nix
new file mode 100644
index 0000000000..1749643f82
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval-thunk-twice.nix
@@ -0,0 +1 @@
+let x = throw "lol"; in builtins.map (f: f x) [ builtins.tryEval builtins.tryEval ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.exp
new file mode 100644
index 0000000000..8b6ed7dbac
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.exp
@@ -0,0 +1 @@
+{ v = false; w = { success = false; value = false; }; x = { success = true; value = "x"; }; y = { success = false; value = false; }; z = { success = false; value = false; }; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.nix
new file mode 100644
index 0000000000..e2357c7987
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-tryeval.nix
@@ -0,0 +1,7 @@
+{
+  v = (builtins.tryEval (toString <oink>)).value;
+  w = builtins.tryEval <nope>;
+  x = builtins.tryEval "x";
+  y = builtins.tryEval (assert false; "y");
+  z = builtins.tryEval (throw "bla");
+}
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-unpoison-scope.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-unpoison-scope.nix
index 30e9667da8..539735a8ef 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-unpoison-scope.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-unpoison-scope.nix
@@ -1,7 +1,10 @@
 let
-  poisoned = let
-    true = 1;
-    false = 2;
-    null = 3;
-  in [ true false null ];
-in [ true false null ] ++ poisoned
+  poisoned =
+    let
+      true = 1;
+      false = 2;
+      null = 3;
+    in
+    [ true false null ];
+in
+[ true false null ] ++ poisoned
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-useless-inherit-with.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-useless-inherit-with.nix
index d335e53630..dd768c1aca 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-useless-inherit-with.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-useless-inherit-with.nix
@@ -3,13 +3,14 @@
 # provide the value.
 
 # Provide a dynamic `x` identifier in the scope.
-with ({ x = 1;});
+with ({ x = 1; });
 
 # inherit this `x` as a static identifier
 let inherit x;
 
-# Provide another dynamic `x` identifier
-in with ({ x = 3; });
+  # Provide another dynamic `x` identifier
+in
+with ({ x = 3; });
 
 # Inherited static identifier should have precedence
 x
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.exp
new file mode 100644
index 0000000000..c7e3fc6503
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.exp
@@ -0,0 +1 @@
+[ null true false 42 42 "foo\t\nbar" /home/arthur [ 1 2 3 ] <LAMBDA> <PRIMOP> <PRIMOP-APP> { hello = "world"; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.nix
new file mode 100644
index 0000000000..d34ed1697e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-display.nix
@@ -0,0 +1,16 @@
+# Sanity check of how values are rendered by tvix vs. nix-instantiate(1).
+# Ensures that we can use this test suite to compare against C++ Nix.
+[
+  null
+  true
+  false
+  42
+  42.0
+  "foo\t\nbar"
+  /home/arthur
+  [ 1 2 3 ]
+  (x: x)
+  builtins.add
+  (builtins.substring 0 1)
+  { hello = "world"; }
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.exp
new file mode 100644
index 0000000000..27ba77ddaf
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.exp
@@ -0,0 +1 @@
+true
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.nix
new file mode 100644
index 0000000000..c2ca913af2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-compare.nix
@@ -0,0 +1,6 @@
+# For an explanation of this behavior see //tvix/docs/value-pointer-equality.md
+let
+  f = owo: "thia";
+in
+
+[ f 42 ] > [ f 21 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.exp
new file mode 100644
index 0000000000..aec30f297a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.exp
@@ -0,0 +1 @@
+[ true true true true false false false true true true true true true true true true false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.nix
new file mode 100644
index 0000000000..b5cfbeb12e
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-value-pointer-equality.nix
@@ -0,0 +1,46 @@
+# For an explanation of this behavior see //tvix/docs/value-pointer-equality.md
+let
+  # Some incomparable values
+  f = MC: "Boing";
+  t = [ (throw "is a little blue man") ];
+  a = { "with" = abort "headphones and a big smile."; };
+
+  # Aliases
+  f' = f;
+  t' = t;
+  a' = a;
+
+  peq1 = a: b: [ a ] == [ b ];
+  peq2 = a: b: { x = a; } == { x = b; };
+in
+
+[
+  # pointer equality of functions
+  (peq1 f f)
+  (peq2 f f)
+  (peq1 f f')
+  (peq2 f f')
+
+  # encapsulation is necessary for pointer equality
+  (f == f)
+  (f == f')
+  # works with !=
+  ([ f ] != [ f' ])
+
+  # thunks that fail to evaluated wrapped in sets/lists
+  (peq1 t t)
+  (peq2 t t)
+  (peq1 a a)
+  (peq2 a a)
+  (peq1 t t')
+  (peq2 t t')
+  (peq1 a' a)
+  (peq2 a' a)
+
+  # function equality with builtins.elem
+  (builtins.elem f [ 21 f 42 ])
+
+  # pointer inequality
+  (peq1 f (x: x))
+  (peq2 (x: x) f)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-dynamic-key.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-dynamic-key.nix
index c44455a5bf..bf221746c0 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-dynamic-key.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-dynamic-key.nix
@@ -9,4 +9,5 @@ let
     ${with set1; key} = 20;
     ${with { key = "c"; }; key} = 2;
   };
-in set2.a + set2.b + set2.c
+in
+set2.a + set2.b + set2.c
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-list.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-list.nix
index bb62fdf31c..3e85cbee45 100644
--- a/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-list.nix
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-with-in-list.nix
@@ -6,7 +6,8 @@ let
   set = {
     value = 2;
   };
-in [
+in
+[
   1
   (with set; value)
   3
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-xml.exp.xml b/tvix/eval/src/tests/tvix_tests/eval-okay-xml.exp.xml
new file mode 100644
index 0000000000..1521bcc97a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-xml.exp.xml
@@ -0,0 +1,41 @@
+<?xml version='1.0' encoding='utf-8'?>
+<expr>
+  <attrs>
+    <attr name="attrspat">
+      <function>
+        <attrspat name="args">
+          <attr name="x" />
+          <attr name="y" />
+          <attr name="z" />
+        </attrspat>
+      </function>
+    </attr>
+    <attr name="attrspat-ellipsis">
+      <function>
+        <attrspat ellipsis="1" name="args">
+          <attr name="x" />
+          <attr name="y" />
+          <attr name="z" />
+        </attrspat>
+      </function>
+    </attr>
+    <attr name="noattrspat">
+      <function>
+        <attrspat>
+          <attr name="x" />
+          <attr name="y" />
+          <attr name="z" />
+        </attrspat>
+      </function>
+    </attr>
+    <attr name="noattrspat-ellipsis">
+      <function>
+        <attrspat ellipsis="1">
+          <attr name="x" />
+          <attr name="y" />
+          <attr name="z" />
+        </attrspat>
+      </function>
+    </attr>
+  </attrs>
+</expr>
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-xml.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-xml.nix
new file mode 100644
index 0000000000..3cc5acf430
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-xml.nix
@@ -0,0 +1,7 @@
+{
+  attrspat = args@{ x, y, z }: x;
+  attrspat-ellipsis = args@{ x, y, z, ... }: x;
+
+  noattrspat = { x, y, z }: x;
+  noattrspat-ellipsis = { x, y, z, ... }: x;
+}
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-assert.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-assert.nix
new file mode 100644
index 0000000000..575b1af588
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-assert.nix
@@ -0,0 +1 @@
+{ "assert" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-else.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-else.nix
new file mode 100644
index 0000000000..7601f14b32
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-else.nix
@@ -0,0 +1 @@
+{ "else" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-if.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-if.nix
new file mode 100644
index 0000000000..1c391fc9a3
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-if.nix
@@ -0,0 +1 @@
+{ "if" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-in.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-in.nix
new file mode 100644
index 0000000000..b4f238651d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-in.nix
@@ -0,0 +1 @@
+{ "in" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-inherit.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-inherit.nix
new file mode 100644
index 0000000000..e62ed32b04
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-inherit.nix
@@ -0,0 +1 @@
+{ "inherit" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-let.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-let.nix
new file mode 100644
index 0000000000..196ec7cc88
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-let.nix
@@ -0,0 +1 @@
+{ "let" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-rec.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-rec.nix
new file mode 100644
index 0000000000..d2c4f93a2a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-rec.nix
@@ -0,0 +1 @@
+{ "rec" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-then.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-then.nix
new file mode 100644
index 0000000000..f2af8d6970
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-then.nix
@@ -0,0 +1 @@
+{ "then" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-with.nix b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-with.nix
new file mode 100644
index 0000000000..cbcfa970c2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/identity-quoted-attrname-with.nix
@@ -0,0 +1 @@
+{ "with" = true; }
diff --git a/tvix/eval/src/tests/tvix_tests/lib.nix b/tvix/eval/src/tests/tvix_tests/lib.nix
new file mode 100644
index 0000000000..ab509bc85f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/lib.nix
@@ -0,0 +1,64 @@
+with builtins;
+
+rec {
+
+  fold = op: nul: list:
+    if list == [ ]
+    then nul
+    else op (head list) (fold op nul (tail list));
+
+  concat =
+    fold (x: y: x + y) "";
+
+  and = fold (x: y: x && y) true;
+
+  flatten = x:
+    if isList x
+    then fold (x: y: (flatten x) ++ y) [ ] x
+    else [ x ];
+
+  sum = foldl' (x: y: add x y) 0;
+
+  hasSuffix = ext: fileName:
+    let
+      lenFileName = stringLength fileName;
+      lenExt = stringLength ext;
+    in
+    !(lessThan lenFileName lenExt) &&
+    substring (sub lenFileName lenExt) lenFileName fileName == ext;
+
+  # Split a list at the given position.
+  splitAt = pos: list:
+    if pos == 0 then { first = [ ]; second = list; } else
+    if list == [ ] then { first = [ ]; second = [ ]; } else
+    let res = splitAt (sub pos 1) (tail list);
+    in { first = [ (head list) ] ++ res.first; second = res.second; };
+
+  # Stable merge sort.
+  sortBy = comp: list:
+    if lessThan 1 (length list)
+    then
+      let
+        split = splitAt (div (length list) 2) list;
+        first = sortBy comp split.first;
+        second = sortBy comp split.second;
+      in
+      mergeLists comp first second
+    else list;
+
+  mergeLists = comp: list1: list2:
+    if list1 == [ ] then list2 else
+    if list2 == [ ] then list1 else
+    if comp (head list2) (head list1) then [ (head list2) ] ++ mergeLists comp list1 (tail list2) else
+    [ (head list1) ] ++ mergeLists comp (tail list1) list2;
+
+  id = x: x;
+
+  const = x: y: x;
+
+  range = first: last:
+    if first > last
+    then [ ]
+    else genList (n: first + n) (last - first + 1);
+
+}
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys.nix
new file mode 100644
index 0000000000..d4e93e1f28
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys.nix
@@ -0,0 +1,9 @@
+# Attribute sets can't be compared, only checked for equality
+builtins.genericClosure {
+  startSet = [
+    { key = { foo = 21; }; }
+  ];
+  operator = _: [
+    { key = { bar = 21; }; }
+  ];
+}
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys2.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys2.nix
new file mode 100644
index 0000000000..0589a3ab59
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-fail-builtins-genericClosure-uncomparable-keys2.nix
@@ -0,0 +1,12 @@
+let
+  id = x: x;
+in
+
+builtins.genericClosure {
+  startSet = [{ key = id; first = true; }];
+  operator =
+    { first, ... }:
+    if first then [
+      { key = id; first = false; }
+    ] else [ ];
+}
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.exp b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.exp
new file mode 100644
index 0000000000..097eb2033a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.exp
@@ -0,0 +1 @@
+[ true true true true true true true true true true ]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.nix
new file mode 100644
index 0000000000..aa2a0a1e19
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-builtins-set-pointer-equality.nix
@@ -0,0 +1,25 @@
+let
+  alias = builtins;
+in
+
+[
+  (builtins == builtins)
+  (alias == builtins)
+  (builtins == builtins.builtins)
+  (builtins.builtins == builtins.builtins)
+  (builtins.builtins == builtins.builtins.builtins)
+  (alias == alias)
+  (alias == builtins.builtins)
+  ([ builtins ] == [ builtins ])
+
+  # Surprisingly the following expressions don't work. They are
+  # here for documentation purposes and covered only
+  # by eval-okay-select-pointer-inequality.nix. Reasoning is that
+  # we may not want / be able to replicate this behavior at all.
+  #   ([ builtins.add ] == [ builtins.add ])
+  #   ({ inherit (builtins) import; } == { inherit (builtins) import; })
+
+  # These expressions work as expected, however:
+  (let x = { inherit (builtins) add; }; in x == x)
+  (let inherit (builtins) add; in [ add ] == [ add ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.exp b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.exp
new file mode 100644
index 0000000000..9c44023f02
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.exp
@@ -0,0 +1 @@
+[ { car = 42; cdr = «repeated»; } [ «repeated» «repeated» «repeated» ] { val = 42; wal = «repeated»; xal = «repeated»; } { tail1 = «repeated»; tail2 = «repeated»; val = 42; } { tail1 = «repeated»; tail2 = «repeated»; val = 21; } ]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.nix
new file mode 100644
index 0000000000..ac849a58fe
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-cycle-display-cpp-nix-2.13.nix
@@ -0,0 +1,34 @@
+let
+  linkedList = {
+    car = 42;
+    cdr = linkedList;
+  };
+
+  list = [
+    linkedList
+    linkedList
+    linkedList
+  ];
+
+  set = {
+    val = 42;
+    wal = set;
+    xal = set;
+  };
+
+  multiTail = {
+    val = 42;
+    tail1 = multiTail;
+    tail2 = multiTail;
+  };
+in
+
+[
+  linkedList
+  list
+  set
+
+  # In C++ Nix 2.3 these would be displayed differently
+  multiTail
+  (let multiTail = { val = 21; tail1 = multiTail; tail2 = multiTail; }; in multiTail)
+]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.exp b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.exp
new file mode 100644
index 0000000000..967fc858bc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.exp
@@ -0,0 +1 @@
+[ "abort" "add" "addErrorContext" "all" "any" "appendContext" "attrNames" "attrValues" "baseNameOf" "bitAnd" "bitOr" "bitXor" "builtins" "catAttrs" "compareVersions" "concatLists" "concatMap" "concatStringsSep" "currentSystem" "currentTime" "deepSeq" "derivation" "derivationStrict" "dirOf" "div" "elem" "elemAt" "false" "fetchGit" "fetchMercurial" "fetchTarball" "fetchurl" "filter" "filterSource" "findFile" "foldl'" "fromJSON" "fromTOML" "functionArgs" "genList" "genericClosure" "getAttr" "getContext" "getEnv" "hasAttr" "hasContext" "hashFile" "hashString" "head" "import" "intersectAttrs" "isAttrs" "isBool" "isFloat" "isFunction" "isInt" "isList" "isNull" "isPath" "isString" "langVersion" "length" "lessThan" "listToAttrs" "map" "mapAttrs" "match" "mul" "nixPath" "nixVersion" "null" "parseDrvName" "partition" "path" "pathExists" "placeholder" "readDir" "readFile" "removeAttrs" "replaceStrings" "scopedImport" "seq" "sort" "split" "splitVersion" "storeDir" "storePath" "stringLength" "sub" "substring" "tail" "throw" "toFile" "toJSON" "toPath" "toString" "toXML" "trace" "true" "tryEval" "typeOf" "unsafeDiscardOutputDependency" "unsafeDiscardStringContext" "unsafeGetAttrPos" ]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.nix
new file mode 100644
index 0000000000..4480daecd9
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-minimal-2.3-builtins.nix
@@ -0,0 +1,122 @@
+# This tests verifies that the Nix implementation evaluating this has at least
+# all the builtins given in `minimalBuiltins`. We don't test a precise list of
+# builtins since we accept that there will always be difference between the
+# builtins sets of Tvix, C++ Nix 2.3 and newer C++ Nix versions, as new builtins
+# are added.
+#
+# Tvix also may choose never to implement some builtins if they are only useful
+# for flakes or perform well enough via the shims nixpkgs usually provides.
+
+let
+  # C++ Nix 2.3 builtins except valueSize which is removed in later versions
+  minimalBuiltins = [
+    "abort"
+    "add"
+    "addErrorContext"
+    "all"
+    "any"
+    "appendContext"
+    "attrNames"
+    "attrValues"
+    "baseNameOf"
+    "bitAnd"
+    "bitOr"
+    "bitXor"
+    "builtins"
+    "catAttrs"
+    "compareVersions"
+    "concatLists"
+    "concatMap"
+    "concatStringsSep"
+    "currentSystem"
+    "currentTime"
+    "deepSeq"
+    "derivation"
+    "derivationStrict"
+    "dirOf"
+    "div"
+    "elem"
+    "elemAt"
+    "false"
+    "fetchGit"
+    "fetchMercurial"
+    "fetchTarball"
+    "fetchurl"
+    "filter"
+    "filterSource"
+    "findFile"
+    "foldl'"
+    "fromJSON"
+    "fromTOML"
+    "functionArgs"
+    "genList"
+    "genericClosure"
+    "getAttr"
+    "getContext"
+    "getEnv"
+    "hasAttr"
+    "hasContext"
+    "hashFile"
+    "hashString"
+    "head"
+    "import"
+    "intersectAttrs"
+    "isAttrs"
+    "isBool"
+    "isFloat"
+    "isFunction"
+    "isInt"
+    "isList"
+    "isNull"
+    "isPath"
+    "isString"
+    "langVersion"
+    "length"
+    "lessThan"
+    "listToAttrs"
+    "map"
+    "mapAttrs"
+    "match"
+    "mul"
+    "nixPath"
+    "nixVersion"
+    "null"
+    "parseDrvName"
+    "partition"
+    "path"
+    "pathExists"
+    "placeholder"
+    "readDir"
+    "readFile"
+    "removeAttrs"
+    "replaceStrings"
+    "scopedImport"
+    "seq"
+    "sort"
+    "split"
+    "splitVersion"
+    "storeDir"
+    "storePath"
+    "stringLength"
+    "sub"
+    "substring"
+    "tail"
+    "throw"
+    "toFile"
+    "toJSON"
+    "toPath"
+    "toString"
+    "toXML"
+    "trace"
+    "true"
+    "tryEval"
+    "typeOf"
+    "unsafeDiscardOutputDependency"
+    "unsafeDiscardStringContext"
+    "unsafeGetAttrPos"
+  ];
+
+  intersectLists = as: bs: builtins.filter (a: builtins.elem a bs) as;
+in
+
+intersectLists minimalBuiltins (builtins.attrNames builtins)
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.exp b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.exp
new file mode 100644
index 0000000000..69fd1d0847
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.exp
@@ -0,0 +1 @@
+[ false false false false false true false false ]
diff --git a/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.nix b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.nix
new file mode 100644
index 0000000000..821aa47a0d
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/notyetpassing/eval-okay-non-identifier-pointer-inequality.nix
@@ -0,0 +1,28 @@
+# C++ Nix frequently creates copies of Value structs when evaluating
+# a variety of expressions. As a result, pointer equality doesn't
+# work for many (all?) expressions that go beyond simple identifier
+# access from the scope: Even if the inner representation of the
+# value still has the same memory location, C++ Nix has created
+# a copy of the struct that holds the pointer to this memory.
+# Since pointer equality is established via the location of
+# the latter, not the former, the values are no longer equal
+# by pointer.
+let
+  foo = { bar = x: x; };
+
+  id = x: x;
+in
+
+[
+  ({ inherit (foo) bar; } == { inherit (foo) bar; })
+  ([ foo.bar ] == [ foo.bar ])
+
+  ([ builtins.add ] == [ builtins.add ])
+  ({ inherit (builtins) import; } == { inherit (builtins) import; })
+
+  ([ (id id) ] == [ (id id) ])
+  ([ id ] == [ id ])
+
+  (with foo; [ bar ] == [ bar ])
+  (with builtins; [ add ] == [ add ])
+]
diff --git a/tvix/eval/src/tests/tvix_tests/observable-eval-cache1.nix b/tvix/eval/src/tests/tvix_tests/observable-eval-cache1.nix
new file mode 100644
index 0000000000..b5f3f59a79
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/observable-eval-cache1.nix
@@ -0,0 +1 @@
+let id = x: x; in { inherit id; }
diff --git a/tvix/eval/src/tests/tvix_tests/observable-eval-cache2.nix b/tvix/eval/src/tests/tvix_tests/observable-eval-cache2.nix
new file mode 120000
index 0000000000..7f69c0eb47
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/observable-eval-cache2.nix
@@ -0,0 +1 @@
+observable-eval-cache1.nix
\ No newline at end of file
diff --git a/tvix/eval/src/tests/tvix_tests/observable-eval-cache3.nix b/tvix/eval/src/tests/tvix_tests/observable-eval-cache3.nix
new file mode 100644
index 0000000000..b5f3f59a79
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/observable-eval-cache3.nix
@@ -0,0 +1 @@
+let id = x: x; in { inherit id; }
diff --git a/tvix/eval/src/tests/tvix_tests/readDir/bar b/tvix/eval/src/tests/tvix_tests/readDir/bar
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/readDir/bar
diff --git a/tvix/eval/src/tests/tvix_tests/readDir/foo/.keep b/tvix/eval/src/tests/tvix_tests/readDir/foo/.keep
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/readDir/foo/.keep