dotnet/csharplang

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The official repo for the design of the C# programming language

Stars: 12.7k
Forks: 1.1k
Open beginner issues: 0
Indexed issues: 247
Avg merge: 11h 1m
Merged PRs (30d): 3

Dominant language: C#
License: No license data
Last GitHub push: Aug 31, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Open All

247 open issues indexed

Fixed/moveable variables versus locals captured in a lambda Open

Spec

dotnet/csharplang#2496 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Expression variables in initializers" (15.7) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#32 · 5 comments · 9 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Null-coalescing assignments" (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal champion Smallish Feature

dotnet/csharplang#34 · 100 comments · 178 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Nullable reference types" (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#36 · 259 comments · 267 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Private protected" (C# 7.2, VB 15.5) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#37 · 65 comments · 19 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Readonly ref" (C# 7.2) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#38 · 77 comments · 41 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Records" (VS 16.8, .NET 5) Open

Design Review Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#39 · 277 comments · 442 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Auto-Implemented Property Field-Targeted Attributes" (15.7) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#42 · 1 comment · 25 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Async Streams" (including async disposable) (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#43 · 67 comments · 108 reactions · 0 assignees · Indexed Sep 15, 2026
Champion "Pattern Matching" (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#45 · 16 comments · 26 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Covariant Return Types" (VS 16.8, .NET 5) Open

Design Review Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#49 · 123 comments · 270 reactions · 2 assignees · Indexed Sep 15, 2026
Champion "default interface methods" (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#52 · 763 comments · 267 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Binary Literals" and "Digit Separators" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#55 · 4 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026
Champion "Local Functions" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#56 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "type switch" (part of pattern-matching added in C# 7) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#57 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "ref returns" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#58 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Champion "tuples" (C# 7.0, VB 15.0) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#59 · 2 comments · 3 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "out var" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#60 · 2 comments · 4 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "value task" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#61 · 3 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "throw expression" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#62 · 2 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "expression-bodied everything" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#63 · 2 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "allow digit separator after 0b or 0x" (C# 7.2, VB 15.5) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#65 · 3 comments · 7 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Async Main" (C# 7.1) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#97 · 21 comments · 69 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Improved overload candidates" (15.7) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#98 · 18 comments · 57 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Allow no-arg constructor and field initializers in struct declarations" Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#99 · 360 comments · 80 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Target-typed `new` expression" (VS 16.8, .NET 5) Open

Design Review Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#100 · 204 comments · 273 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "default" expression (C# 7.1) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#102 · 5 comments · 22 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Allow `System.Delegate` as a constraint" (15.7) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#103 · 5 comments · 35 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Allow `System.Enum` as a constraint" (15.7) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#104 · 136 comments · 110 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Lambda discard parameters" (VS 16.8, .NET 5) Open

Implemented Needs ECMA Spec Proposal Proposal champion Smallish Feature

dotnet/csharplang#111 · 97 comments · 148 reactions · 1 assignee · Indexed Sep 15, 2026
Champion: Implicitly scoped using statement (16.3, Core 3) Open

Feature Request Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#114 · 61 comments · 118 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Allow Generic Attributes" Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#124 · 62 comments · 295 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Mix Declarations and Variables in Deconstruction" Open

Implemented Needs ECMA Spec Proposal Proposal champion Smallish Feature

dotnet/csharplang#125 · 4 comments · 57 reactions · 1 assignee · Indexed Sep 15, 2026
Proposal: File scoped namespaces Open

Feature Request Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#137 · 183 comments · 341 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "pattern-matching with generics" (C# 7.1) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#154 · 16 comments · 21 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "utf8 string literals" Open

Design Review Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#184 · 58 comments · 80 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "slicing" / Range (16.3, Core 3) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#185 · 297 comments · 80 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "ref extension methods on structs" (C# 7.2) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#186 · 7 comments · 51 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "blittable"/"unmanaged" constraint (15.7) Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#187 · 56 comments · 47 reactions · 2 assignees · Indexed Sep 15, 2026
Champion "Support for == and != on tuple types" (15.7) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#190 · 72 comments · 38 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "conditional ref operator" (C# 7.2) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#223 · 17 comments · 25 reactions · 1 assignee · Indexed Sep 15, 2026
Proposal: Use static keyword for lambdas to disallow capturing locals and parameters (VS 16.8, .NET 5) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#275 · 71 comments · 121 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "CallerArgumentExpression" Open

Implemented Needs ECMA Spec Proposal champion Soon candidate

dotnet/csharplang#287 · 82 comments · 147 reactions · 1 assignee · Indexed Sep 15, 2026
C# Spec: Constraints checking in late bound invocations Open

Spec

dotnet/csharplang#300 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support for method parameter names in nameof() Open

Implemented Needs ECMA Spec Proposal Proposal champion

dotnet/csharplang#373 · 33 comments · 119 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "tuple projection initializers" (C# 7.1, VB 15.3) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#415 · 5 comments · 14 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "discards" (C# 7.0) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#422 · 4 comments · 3 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Native-Sized Number Types" (VS 16.8, .NET 5) Open

Design Review Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#435 · 81 comments · 59 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Non-trailing named arguments" (C# 7.2, VB 15.5) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#570 · 2 comments · 30 reactions · 1 assignee · Indexed Sep 15, 2026
Champion "Span<T>, aka interior pointer, aka stackonly struct" (C# 7.2) Open

Implemented Needs ECMA Spec Proposal champion

dotnet/csharplang#666 · 18 comments · 41 reactions · 1 assignee · Indexed Sep 15, 2026

dotnet/csharplang

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