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
 (638 indexed issues)
open beginner issues
 (633 open beginner issues)
Latest indexed
Aug 14, 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

Open
`args` is nullable-oblivious in top-level statements
Area-CompilersFeature - Nullable Reference TypesFeature - Simple Programshelp wanted
Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available

dotnet / roslyn · #84293 · Jun 25, 2026 · C# · 20,414 stars

3 comments0 reactions1 assignee
Open
False positive CS8619 warning using `-=` with `byte?`
Area-CompilersBugFeature - Nullable Reference Typeshelp wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available

dotnet / roslyn · #82552 · Feb 26, 2026 · C# · 20,414 stars

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

dotnet / roslyn · #82423 · Feb 16, 2026 · C# · 20,414 stars

4 comments0 reactions0 assignees
Open
improve CS9293 message to show it's about "static"
Area-CompilersConcept-Diagnostic ClarityFeature - Extension Everythinghelp wanted
Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available

dotnet / roslyn · #82351 · Feb 10, 2026 · C# · 20,414 stars

8 comments0 reactions1 assignee
Open
CS0219 not working for non-primitive types
Area-CompilersConcept-Diagnostic Clarityhelp wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available

dotnet / roslyn · #81743 · Dec 17, 2025 · C# · 20,414 stars

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

dotnet / roslyn · #81679 · Dec 13, 2025 · C# · 20,414 stars

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

dotnet / roslyn · #81653 · Dec 11, 2025 · C# · 20,414 stars

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

dotnet / roslyn · #82173 · Dec 6, 2025 · C# · 20,414 stars

7 comments0 reactions0 assignees
Open
Suboptimal codegen for `is` pattern compared to .NET 6/7
Area-CompilersCode Gen QualityOngoing-Quality-Candidatehelp wanted
Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available

dotnet / roslyn · #80052 · Aug 26, 2025 · C# · 20,414 stars

3 comments1 reaction1 assignee