Scoped #nowarn

[Martin521]

Description

This is a draft PR (WiP) for a scoped #nowarn.

Checklist

• implementation for impl files
• draft RFC
• implementation for sig files
• check if scripts are covered
• handle #line directives correctly
• handle #line directives correctly, part 2
• relaxation of placement rules for the directives
• handle #line directives correctly, version 3
• handle #line directives correctly, version 4
• implementation for service and interactive
• warning for invalid warn directive arguments
• send the right trivia
• more tests
• code improvements
• RFC proposal, creation of discussion thread
• RFC discussions and changes, possibly implementation changes, RFC approval and merge
• Release notes
• re-create the PR, with digestible sequential commits
• Notes for reviewers
• Review

Post-merge checklist

• Update the documentation as specified in the RFC
• Further cleanup / refactoring around diagnostics

[github-actions]

❗ Release notes required

@Martin521,

Caution

No release notes found for the changed paths (see table below).

Please make sure to add an entry with an informative description of the change as well as link to this pull request, issue and language suggestion if applicable. Release notes for this repository are based on Keep A Changelog format.

The following format is recommended for this repository:

* <Informative description>. ([PR #XXXXX](https://github.com/dotnet/fsharp/pull/XXXXX))

See examples in the files, listed in the table below or in th full documentation at https://fsharp.github.io/fsharp-compiler-docs/release-notes/About.html.

If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/9.0.200.md	No release notes found or release notes format is not correct
LanguageFeatures.fsi	docs/release-notes/.Language/preview.md	No release notes found or release notes format is not correct