Repository Issues

dotnet/roslyn

The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

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Stars
 (20,414 stars)
Forks
 (4,257 forks)
Indexed issues
 (635 indexed issues)
open beginner issues
 (631 open beginner issues)
Latest indexed
Jul 5, 2026
Last GitHub push
May 15, 2026
License
MIT License
Contributing guide
Contributing guide
Code of conduct
Code of conduct
Dominant language
C#
PR merge metrics
 (Avg merge 6d 17h) (256 merged PRs in 30d)
Beginner labels
help wanted

Issues

633 open indexed issues

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Open
`args` is nullable-oblivious in top-level statements
Area-CompilersFeature - Nullable Reference TypesFeature - Simple Programshelp wanted

dotnet/roslyn #84,293 opened Jun 25, 2026 · C# · 20,414 stars

Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available
3 comments0 reactions1 assignee
Open
compilation error for multiple top-level statements
Area-CompilersConcept-Diagnostic ClarityFeature - Simple Programshelp wanted

dotnet/roslyn #83,691 opened May 12, 2026 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
False positive CS8619 warning using `-=` with `byte?`
Area-CompilersBugFeature - Nullable Reference Typeshelp wanted

dotnet/roslyn #82,552 opened Feb 26, 2026 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Improve CS9105 in static context
Area-CompilersConcept-Diagnostic ClarityFeature - Primary Constructorshelp wanted

dotnet/roslyn #82,423 opened Feb 16, 2026 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
4 comments0 reactions0 assignees
Open
improve CS9293 message to show it's about "static"
Area-CompilersConcept-Diagnostic ClarityFeature - Extension Everythinghelp wanted

dotnet/roslyn #82,351 opened Feb 10, 2026 · C# · 20,414 stars

Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available
8 comments0 reactions1 assignee
Open
CS0219 not working for non-primitive types
Area-CompilersConcept-Diagnostic Clarityhelp wanted

dotnet/roslyn #81,743 opened Dec 17, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
5 comments1 reaction0 assignees
Open
CS8618 suggests using `required` on events.
Area-CompilersConcept-Diagnostic Clarityhelp wanted

dotnet/roslyn #81,679 opened Dec 13, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
2 comments0 reactions0 assignees
Open
intellisense in VB.net is broken
Area-IDEhelp wanted

dotnet/roslyn #81,653 opened Dec 11, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Honor BuildInParallel
Area-Compilershelp wanted

dotnet/roslyn #82,173 opened Dec 6, 2025 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
7 comments0 reactions0 assignees
Open
Suboptimal codegen for `is` pattern compared to .NET 6/7
Area-CompilersCode Gen QualityOngoing-Quality-Candidatehelp wanted

dotnet/roslyn #80,052 opened Aug 26, 2025 · C# · 20,414 stars

Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available
3 comments1 reaction1 assignee