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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
 (636 indexed issues)
open beginner issues
 (629 open beginner issues)
Latest indexed
Jul 24, 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

632 open indexed issues

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Open
Branchless codegen for lifted nullable operators in VB
Area-CompilersCode Gen QualityLanguage-VBhelp wanted

dotnet/roslyn #26,008 opened Apr 6, 2018 · 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
Decompilation should put new lines between blocks
Area-IDEIDE-Formatterhelp wanted

dotnet/roslyn #25,303 opened Mar 7, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
16 comments0 reactions0 assignees
Open
FAQ links are broken?
Area-CompilersDocumentationhelp wanted

dotnet/roslyn #25,158 opened Mar 1, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
6 comments1 reaction0 assignees
Open
Pressing SHIFT+ENTER in Immediate window crashes editor
Area-InteractiveBugTenet-Reliabilityhelp wanted

dotnet/roslyn #25,051 opened Feb 26, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · No comments yet
No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available
0 comments0 reactions0 assignees
Open
Shortcomings in computing diagnostics for extension methods
Area-CompilersBugConcept-Design DebtConcept-Diagnostic Clarityhelp wanted

dotnet/roslyn #24,787 opened Feb 12, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · No comments yet
No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available
0 comments0 reactions0 assignees
Open
Highlight References not symmetric in Tuples
Area-IDEBugDeveloper Communityhelp wanted

dotnet/roslyn #24,268 opened Jan 16, 2018 · 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
Document encoding gets lost on Project.AddDocument
Area-AnalyzersBughelp wanted

dotnet/roslyn #24,045 opened Jan 4, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
13 comments1 reaction0 assignees
Open
One missing closing bracket creates dozens of errors
Area-CompilersBugConcept-Diagnostic ClarityDeveloper CommunityLanguage-VBhelp wanted

dotnet/roslyn #24,028 opened Jan 4, 2018 · 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
Conversion of a stackalloc expression
Area-CompilersBugConcept-Diagnostic ClarityFeature - Readonly Referenceshelp wanted

dotnet/roslyn #23,995 opened Jan 2, 2018 · C# · 20,414 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
7 comments1 reaction0 assignees