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Per https://nnethercote.github.io/perf-book/hashing.html, we have
basically no reason to use the default hasher over a faster,
non-DoS-resistant hasher. This gives a nice perf boost basically for
free:
hello outpath time: [704.76 ms 714.91 ms 725.63 ms]
change: [-7.2391% -6.1018% -4.9189%] (p = 0.00 < 0.05)
Performance has improved.
Change-Id: If5587f444ed3af69f8af4eead6af3ea303b4ae68
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12046
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Autosubmit: aspen <root@gws.fyi>
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This was made unnecessary in c92d06271 (feat(tvix/eval): drop
LightSpan::Delayed, 2023-12-08) because it didn't improve benchmarks as
much as expected and has been vestigial since; this continues the
cleanup by just removing it altogether
Change-Id: I21ec7ae9b52a5cccd2092696a5a87f658194d672
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11949
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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The builtins `placeholder` and `filterSource` are now implemented in
tvix-glue and so we no longer need their placeholder "implementations" in
tvix-eval.
Change-Id: Ibf161ccf1ad40103e9fbb688e9f6be58e7772af1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11867
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>
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This prevents the following statements from looping endlessly:
```
builtins.split "(.*)" ""
builtins.split "([abc]*)" "abc"
builtins.split "(.*)" "abc"
builtins.split ".*" ""
```
Cover these (and some more examples) in the test suite.
Co-Authored-By: Florian Klink <flokli@flokli.de>
Change-Id: Ibd339f971e0f4e3e5c229816e2be5a8e3836fec9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11743
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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In places where we want to extend context with that from another
NixString, use take_context() to split it off, then call .extend(),
making use of IntoIterator to avoid a bunch of clones.
Change-Id: I2460141a3ed776c64c36132b2203b6a1d710b922
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11705
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: edef <edef@edef.eu>
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XmlEmitter gains a NixContext field, and `write_typed_value` extends it
with all context elements present in the passed value.
Once all serialization is done, a into_context() function returns the
collected context, so we can construct a NixString with context.
Tests for this live in tvix-glue, as we use builtins.derivation, which
is not present in the tvix-eval crate.
Fixes b/398.
Change-Id: I85feaaa17b753885f8a017a54e419ec4e602af21
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11704
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Alyssa Ross <hi@alyssa.is>
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This is not necessarily valid UTF-8.
Change-Id: I72f3157240772eb9c558e5699b4785e44d256fd4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11702
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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Have this return the same values as builtins.unsafeGetAttrsPos, rather
than returning a CatchableErrorKind, which crashes the CLI if it bubbles
up.
The environment we're in doesn't allow emitting a warning, as we don't
have `co` in scope, but that's probably OK as a stopgap solution.
Alternative to cl/11665.
Change-Id: I5b2c2530842547c93b6533ed9601ee9b2923b1bf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11685
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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It was returning `{ line, col, file }` instead of `{ line, column, file
}`.
Note this is not a regression in Nix, Nix always had `column` since
2013.
Change-Id: I4871a201b32324dff0432526d0449806a535828f
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11409
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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`toJSON` transform a Nix structure into a JSON string.
For each context in that Nix structure, the JSON string must possess it.
Thus, it is necessary to take the union of all contexts and attach it to
the final structure.
Unfortunately, the return type of `into_json` is a serde's JSON object,
not a string. Therefore, it is not possible to reuse `NixString`
machinery.
Context tests are reinforced as Nix does not test those behaviors.
Fixes b/393.
Change-Id: I5afdbc4e18dd70469192c1aa657d1049ba330149
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11266
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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Right now `builtins.hashFile` always reads the entire file into memory
before hashing, which is not ideal for large files. This replaces
`read_to_string` with `open_file` which allows calculating the hash of
the file without buffering it entirely into memory. Other callers can
continue to buffer into memory if they choose, but they still use the
`open_file` VM request and then call `read_to_string` or `read_to_end`
on the `std::io::Reader`.
Fixes b/380
Change-Id: Ifa1c8324bcee8f751604b0b449feab875c632fda
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11236
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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`appendContext s ctx` will just append a user-crafted context attrs to `s`.
The most important part of this builtin is to perform all the relevant invariant validations
to avoid letting the user craft invalid contexts which can never be built, e.g. invalid store paths,
inexistent derivations, etc.
This version is incomplete and full of TODOs, but passes all the Nix's
context strings tests, so we turn them on.
Change-Id: I625dc5e7c4f5b784f078b390f04b0ee5a8d65a7c
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11263
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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This builtin only transforms any `NixContextElement::Derivation` into the trivial `NixContextElement::Plain`.
This is a forgetful functor on derivation-deep context strings.
The test coverage of this change is done in cl/11264.
Change-Id: Icd00778c97766be6db8a6bdabaa59e9724353ec5
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11262
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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Nixpkgs make use of it and this is a 2.3 builtin that was missed.
Change-Id: If36d748eed4a5f777344556c0802392c76c8d53c
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11260
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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The accompanying test case shows that we need to bubble up the catchable
error from the equality check if one is created.
Change-Id: Ic9929a57aa7653c8aa5a72d1711cf3264798c731
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11159
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
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It is pretty pointless to force the function argument if we are going to
use a suspended call later since forcing the function may fail in ways
that are not covered by Catchables (non-recoverable errors, infinite
recursions). From this, it kind of seems as if using #[catch] is never
correct and should be replaced by #[lazy]. Also we should probably try
to come up with more test cases for stuff where laziness gets us out of
the jam as an equivalent to the catchable tests for nonrecoverable
errors.
Fixes b/386.
Change-Id: Ia926df4ac1b440ec430403ab7b40924a0c97221b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11153
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
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Change-Id: Ia1058a5ea687f413fbb62365da199032bdbd3fd2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11155
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
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The primary addition is the `builtin_hashFile` function which attempts
value-path coercion and on success reads the file to a nix_string.
Similar to the `builtins_hashString` implementation, the hash is then
derived using the `hash_nix_string` function in the introduced hash
module which has extracted hashing functionality initially specified in
cl/11005.
Change-Id: I5e3ef0317223af99488ebb79efc2fb49b4cbc1b6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11007
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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Implements md5, sha1, sha256 and sha512 using the related crates from
the RustCrypto hashes project (https://github.com/RustCrypto/hashes)
Change-Id: I00730dea44ec9ef85309edc27addab0ae88814b8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11005
Tested-by: BuildkiteCI
Reviewed-by: aspen <root@gws.fyi>
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One last place where we needed to wrap the forcing of the element of a
list in `try_value!`. This fixes a previously `notyetpassing` test
Change-Id: I8827a3e39630e6959013b70bdfa9cbcb93f4e91c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10789
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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This is now the only enum variant for Value that is larger than 8
bytes (it's 16 bytes), so boxing it (especially since it's not
perf-critical) allows us to get the Value size down to only 16 bytes!
Change-Id: I98598e2b762944448bef982e8ff7da6d6683c4aa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10798
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Autosubmit: aspen <root@gws.fyi>
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This reverts commit d3d41552cf1f6485f8ebc597a2128a0d15b030a5.
This was well-intentioned, but now the boxed Path values are actually
the *largest* Value enum variants, at 16 bytes (because they're
fat-pointers, with a len) instead of 8 bytes like all the other values.
Having the double reference is a reasonable price to pay (it seems; more
benchmarks may end up disagreeing) for a smaller Value repr.
Change-Id: I0d3e84f646c8f5ffd0b7259c4e456637eea360f7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10797
Tested-by: BuildkiteCI
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
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Storing a full BString here incurs the extra overhead of the capacity
for the inner byte-vector, which we basically never use as Nix strings
are immutable (and we don't do any mutation / sharing analysis).
Switching to a Box<BStr> cuts us from 72 bytes to 64 bytes per
string (and there are a lot of strings!)
Change-Id: I11f34c14a08fa02759f260b1c78b2a2b981714e4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10794
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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These strings are allocated once and never changed, so they don't need
the additional overhead of a capacity given by String - instead, we can
use Box<str> and save on 16 bytes for each of these, *and* for each
Value since this is currently the largest Value variant.
Change-Id: I3e5cb070fe6c5bf82114c92d04f6bae775663a7e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10796
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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In order to correctly propagate errors in the comparator passed to
builtins.sort, we need to do all the sorting in a context where we can
short-circuit return `Value`s (because catchables are Values on the `Ok`
side of the Result , not `Err`s). Unfortunately this means we have
to *inline* the List `sort_by` implementation into the builtin_sort
function - fortunately this is the only place that was called so this is
relatively low cost. This does that, and adds the requisite `try_value!`
invocation to allow us to propagate comparator errors here.
As before, this doesn't include tests, primarily since those are coming
in the next commit.
Change-Id: I8453c3aa2cd82299eae89828e2a2bb118da4cd48
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10754
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
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Nix doesn't propagate errors for the function argument to some builtins,
like genList and map:
❯ nix repl
Welcome to Nix version 2.3.17. Type :? for help.
nix-repl> (builtins.tryEval (builtins.genList (builtins.throw "a") 10)).success
true
nix-repl> (builtins.tryEval (builtins.map (builtins.throw "a") [ "" ])).success
true
Note that this is untested as of this particular commit, only because a
big test suite covering all sorts of catchable error propagation issues
is coming next
Change-Id: I48c8eb390a541204b1a6d438c753fa1ca9b3877e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10753
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
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Propagate catchables that we get from forcing thunks in builtins in a
few more places using the new try_value! macro
Change-Id: I95fd41a231f877ff153f4adbabd944372d4cc7eb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10738
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
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Rather than explicitly checking for Value::Catchable in all builtins,
make the #[builtin] proc macro insert this for all strict arguments by
default, with support for a #[catch] attribute on the argument to
disable this behavior. That attribute hasn't actually been *used*
anywhere here, primarily because the tests pass without it, even for
those builtins which weren't previously checking for Value::Catchable -
if some time passes without this being used I might get rid of support
for it entirely.
There's also a `try_value` macro in builtins directly for the places
where builtins were eg forcing something, then explicitly propagating a
catchable value.
Change-Id: Ie22037b9d3e305e3bdb682d105fe467bd90d53e9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10732
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
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NixString is *quite* large - like 80 bytes - because of the extra
capacity value for BString and because of the context. We want to keep
Value small since we're passing it around a lot, so let's box the
NixString inside Value::String to save on some memory, and make cloning
ostensibly a little cheaper
Change-Id: I343c8b4e7f61dc3dcbbaba4382efb3b3e5bbabb2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10729
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
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PathBuf internally contains a heap pointer (an OsString), so we were in
effect double-boxing here. Removing the extra layer by making
Tvix::Value represented by a Box<Path> rather than a Box<PathBuf> saves
us an indirection, while still avoiding the extra memory overhead of the
capacity which was the reason we were boxing PathBuf in the first place.
Change-Id: I8c185b9d4646161d1921917f83e87421496a3e24
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10725
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
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C++ nix uses C-style zero-terminated char pointers to represent strings
internally - however, up to this point, tvix has used Rust `String` and
`str` for string values. Since those are required to be valid utf-8, we
haven't been able to properly represent all the string values that Nix
supports.
To fix that, this change converts the internal representation of the
NixString struct from `Box<str>` to `BString`, from the `bstr` crate -
this is a wrapper around a `Vec<u8>` with extra functions for treating
that byte vector as a "morally string-like" value, which is basically
exactly what we need.
Since this changes a pretty fundamental assumption about a pretty core
type, there are a *lot* of changes in a lot of places to make this work,
but I've tried to keep the general philosophy and intent of most of the
code in most places intact. Most notably, there's nothing that's been
done to make the derivation stuff in //tvix/glue work with non-utf8
strings everywhere, instead opting to just convert to String/str when
passing things into that - there *might* be something to be done there,
but I don't know what the rules should be and I don't want to figure
them out in this change.
To deal with OS-native paths in a way that also works in WASM for
tvixbolt, this also adds a dependency on the "os_str_bytes" crate.
Fixes: b/189
Fixes: b/337
Change-Id: I5e6eb29c62f47dd91af954f5e12bfc3d186f5526
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10200
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: aspen <root@gws.fyi>
Tested-by: BuildkiteCI
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It's debateable on whether the serialization code should be exposed a
bit more prominently or not.
Change-Id: Iff7a28f884b1490b12b145dfdadbedacb84fd387
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10684
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
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`throw (throw "a")` should work and propagate the internal throw.
Before this commit, it didn't work.
Change-Id: Id5d46f74e484dba99e912ad9fa211f3bf1617bac
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10600
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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`elem` did not catch the list being a catchable.
This surfaced during Nixpkgs evaluation.
Change-Id: Icf19b94e914e35a435c4412d769ee63ba59ab7b0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10599
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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Previously, we were assembling very naively an attribute set composed of context we saw.
But it was forgetting that `"${drv}${drv.drvPath}"` would contain 2 contexts with the same key, but
with different values, one with `outputs = [ "out" ];` and `allOutputs = true;`.
Following this reasoning and comparing with what Nix does, we ought to merge underlying values systematically.
Hence, I bring `itertools` to perform a group by on the key and merge everything on the fly, it's not
beautiful but it's the best I could find, notice that I don't use
`group_by` but I talk about group by, that is, because `group_by` is a
`group_by_consecutive`, see
https://github.com/rust-itertools/itertools/issues/374.
Initially, I tried to do it without a `into_grouping_map_by`, it was akin to assemble the final `NixAttrs` directly,
it was less readable and harder to pull out because we don't have a lot of in-place mutable functions on
our data structures.
Change-Id: I9933c9bd88ffe04de50dda14f21879b60d8b8cd4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10620
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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`dirOf` forgot to accepts contextful strings, e.g. derivations and propagates this context
further.
Change-Id: I6c05944a3ce5073e243e7676c9be56c48407d657
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10618
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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Yes, `hasContext e` should work where `e` is a contextful strings, otherwise, it is really useless.
Change-Id: I5eb071fc257217d6e8a63fe519132ebd98186696
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10617
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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A bunch of operations in Tvix are not aware of catchable values
and does not propagate them.
In the meantime, as we wait for a better solution, we just offer this
commit for moving the needle.
Change-Id: Ic3f0e1550126b0847b597dfc1402c35e0eeef469
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10473
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Nix does something like:
```cpp
NixStringContext context;
const auto str = state.forceString(*args[1], context, pos, "while evaluating the second argument passed to builtins.split");
```
And then do nothing with that context, therefore, we follow them and
make `split` aware of the context but still do nothing with it.
Change-Id: I4fee1936600ce86d99d00893ca3f64013213935b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10428
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: raitobezarius <tvl@lahfa.xyz>
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Change-Id: I7f0cc42cbebfe5cd27bf6d4f58a4af927b83646a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10423
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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`match` silently ignore the input context and do not propagate
it and successful matches.
The why is unclear but nixpkgs does rely implicitly on this behavior
because dynamic attribute selection cannot be done with contextful
strings.
Change-Id: I5167fa9b2c2db8ecab0c2fb3e9895c9cfce6eeb2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10441
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: I2c5068a28f9883a01b0ff80a5e5ab32ba18bfc1a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10437
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
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And it also preserve the original context if it exists.
Change-Id: I904f7c13b7f003a267aace6301723780fccaafb7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10434
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: raitobezarius <tvl@lahfa.xyz>
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It must propagate context too.
Change-Id: If57c22c9723ea02aa013f69d3dcf96054476d8de
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10433
Tested-by: BuildkiteCI
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: Id0e169084d26dc598091d157563c4d959b66279b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10431
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: Ie26ebd16e95e6a7b6f81051d8269169842978058
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10430
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: raitobezarius <tvl@lahfa.xyz>
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Change-Id: Ie552dabe4cf93cc396c883268a3bee67796dbbd8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10429
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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`substring` has a very funny behavior when it comes to empty strings,
it propagates the context too, this is used in nixpkgs to attach context
to strings without using any builtin: `lib.addContextFrom`.
Change-Id: Id655356799b3485f7519b3d1914c630f9d8416c3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10448
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: Id5a435961ce3a2a2240b3936ea48515650d445d6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10427
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: If73a82a7106de9b479c950741efb70bffabd470a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10424
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
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