test(tvix/eval): update nix_tests suite to C++ Nix master r/6314

Adds new tests for foldl', intersectAttrs as well as fills in missing
.exp files.

New test cases we don't pass:

- fromTOML timestamp capabilities
- path antiquotation
- replaceStrings is lazier on C++ Nix master

The C++ Nix revision used is 7066d21a0ddb421967980094222c4bc1f5a0f45a.

Change-Id: Ic619c96e2d41e6c5ea6fa93f9402b12e564af3c5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8778
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

27 files changed, 396 insertions, 7 deletions

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-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-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-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-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/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/notyetpassing/eval-okay-context-introspection.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-context-introspection.exp
index 27ba77ddaf..03b400cc88 100644
--- 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
@@ -1 +1 @@
-true
+[ 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
index 43178bd2ee..50a78d946e 100644
--- 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
@@ -18,7 +18,24 @@ let
     };
   };
 
-  legit-context = builtins.getContext "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
+  combo-path = "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
+  legit-context = builtins.getContext combo-path;
 
-  constructed-context = builtins.getContext (builtins.appendContext "" desired-context);
-in legit-context == constructed-context
+  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/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-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/notyetpassing/eval-okay-readDir.exp b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp
index bf8d2c14ea..6413f6d4f9 100644
--- a/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp
+++ b/tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-readDir.exp
@@ -1 +1 @@
-{ bar = "regular"; foo = "directory"; }
+{ bar = "regular"; foo = "directory"; ldir = "symlink"; linked = "symlink"; }
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/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/verify-lang-tests/default.nix b/tvix/verify-lang-tests/default.nix
index 7e70b62306..54fa0f908c 100644
--- a/tvix/verify-lang-tests/default.nix
+++ b/tvix/verify-lang-tests/default.nix
@@ -36,6 +36,8 @@ let
           ]
       ) [ "nix_tests" "nix_tests/notyetpassing" "tvix_tests" "tvix_tests/notyetpassing" ];
 
+  latestNixIs215 = lib.versionOlder nix_latest.version "2.16";
+
   skippedLangTests = {
     # TODO(sterni): set up NIX_PATH in sandbox
     "eval-okay-search-path.nix" = true;
@@ -64,6 +66,16 @@ let
     "eval-okay-import-display.nix" = [ nix ];
     # Cycle detection and formatting changed sometime after Nix 2.3
     "eval-okay-cycle-display-cpp-nix-2.13.nix" = [ nix ];
+    # builtins.replaceStrings becomes lazier in Nix 2.16
+    "eval-okay-replacestrings.nix" = [ nix (assert latestNixIs215; nix_latest) ];
+    # builtins.readFileType is added in Nix 2.15
+    "eval-okay-readFileType.nix" = [ nix ];
+    # builtins.fromTOML gains support for timestamps in Nix 2.16
+    "eval-okay-fromTOML-timestamps.nix" = [ nix (assert latestNixIs215; nix_latest) ];
+
+    # TODO(sterni): support diffing working directory and home relative paths
+    # like C++ Nix test suite (using string replacement).
+    "eval-okay-path-antiquotation.nix" = true;
   };
 
   runCppNixLangTests = cpp-nix: