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Scoped nowarn #18047

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Scoped nowarn #18047

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Martin521
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Description

Implements Scoped Nowarn according to (draft) RFC FS-1146.

This PR has taken a while. I had to deal with much more complexity than I imagined when I naively volunteered to tackle the feature request. Anyway, here we are.

I have split the PR into 7 commits that can be reviewed in sequence.
All of them compile, 1 and 4 - 7 also pass all tests locally.

  1. Add the feature flag, baseline tests, and the core WarnScopes module. See src/Compiler/SyntaxTree/WarnScopes.fsi and the RFC for the functionality of the module.

  2. Add the necessary changes to lexing and parsing. Note that the warn directives can no longer be collected during parsing (since they can now appear not only in top-level modules, but anywhere). So we collect them during lexing, similar to the processing of #if/#else/#endif directives.

  3. Remove legacy #nowarn processing (but hold off AST changes)

  4. Integrate the WarnScopes functionality and test it

  5. Add warn directive trivia (but hold off AST changes)

  6. Enable warn directive trivia (which means AST changes)

  7. Remove defunct types and parameters related to former #nowarn processing (more AST changes)

  8. Updated IlVerify baselines (changes in line numbers only)

Checklist

  • Test cases added
  • Performance benchmarks added in case of performance changes
  • Release notes entry updated:

@Martin521 Martin521 requested a review from a team as a code owner November 22, 2024 08:23
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github-actions bot commented Nov 22, 2024

❗ Release notes required


✅ Found changes and release notes in following paths:

Change path Release notes path Description
src/Compiler docs/release-notes/.FSharp.Compiler.Service/9.0.200.md
LanguageFeatures.fsi docs/release-notes/.Language/preview.md

@Martin521 Martin521 closed this Nov 22, 2024
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