roslyn
https://github.com/dotnet/roslyn
C#
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
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- Issues
- Give Razor deeper IVT to Roslyn (and split Razor IDE and Compiler a little)
- Add IAsyncLifetime overhead adjustment to test scheduling
- Generate Constructor from Members - do not offer for primary constructor records
- Improve CS8802 error message to include the conflicting file name
- Unions: `not` pattern is applied to the incoming value itself
- Free pooled objects across cancellation exceptions
- Per server workspace and project factories
- Test host hangs and crashes in LanguageServer and Razor Cohost tests (May 2026)
- Add Razor compiler integration tests for most C# features since C# 8
- Use `params ImmutableArray<T>` on all applicable public APIs.
- Docs
- C# not yet supported