Search results

Tons of exception messages appear when using the new extension syntax

Area-IDE

Status: Open.

#83697 In dotnet/roslyn;

· Neme12 opened on May 14, 2026

RaceCondition in UnusedDirectivesCache leads to -32000 'An item with the same key has already been added'

Area-Razor

Status: Open.

#83692 In dotnet/roslyn;

· Crashdummyy opened on May 14, 2026

[LSP] Microsoft.CodeAnalysis.LanguageServer shows high CPU usage when performing switch on a union in C# 15.

Feature - Unions

Status: Open.

#83687 In dotnet/roslyn;

· nuskey8 opened on May 14, 2026

New public API for Closed Class Hierarchies feature

Area-Compilers

Concept-APIThis issue involves adding, removing, clarification, or modification of an API.This issue involves adding, removing, clarification, or modification of an API.

Feature Request

Status: Open.

Feature

#83678 In dotnet/roslyn;

· RikkiGibson opened on May 13, 2026

·  

18.8

Script compiles with Microsoft.CodeAnalysis.CSharp.Scripting ok, but then fails with Microsoft.CSharp.RuntimeBinder.RuntimeBinderException on run

Area-Interactive

Status: Open.

#83671 In dotnet/roslyn;

· jpmcx opened on May 13, 2026

Rope.Equals uses slow IEnumerable<char> iterator for StringRope, adding unnecessary overhead to large string switch compilation

Area-Compilers

Status: Open.

#83663 In dotnet/roslyn;

· davidmikh opened on May 12, 2026

·  

Backlog

compilation error for multiple top-level statements

Area-Compilers

Concept-Diagnostic ClarityThe issues deals with the ease of understanding of errors and warnings.The issues deals with the ease of understanding of errors and warnings.

Feature - Simple ProgramsTop-level statementsTop-level statements

help wantedThe issue is "up for grabs" - add a comment if you are interested in working on itThe issue is "up for grabs" - add a comment if you are interested in working on it

Status: Open.

#83691 In dotnet/roslyn;

· msinghm104 opened on May 12, 2026

·  

Backlog

Copilot/CCA errors out in roslyn repo

Area-Infrastructure

Status: Open.

#83658 In dotnet/roslyn;

· jcouv opened on May 12, 2026

[Known Build Error] OutOfMemoryExceptions in 32-bit helix test runs

Area-Infrastructure

Known Build Error

Status: Open.

#83640 In dotnet/roslyn;

· jjonescz opened on May 11, 2026

New Unsafe errors have awkward phrasing

Area-Compilers

Concept-Diagnostic ClarityThe issues deals with the ease of understanding of errors and warnings.The issues deals with the ease of understanding of errors and warnings.

Feature - Unsafe Evolution

Status: Open.

#83633 In dotnet/roslyn;

· agocke opened on May 9, 2026

VB compiler drops ByRef property copy-back when another argument contains Await

Area-Compilers

Language-VB

Status: Open.

Bug

#83631 In dotnet/roslyn;

· janding opened on May 8, 2026

·  

18.8

Remove unnecessary permitted flags from call sites of Symbol.ReportExplicitUseOfReservedAttributes

Area-Compilers

Concept-Design DebtEngineering Debt, Design Debt, or poor product code qualityEngineering Debt, Design Debt, or poor product code quality

Status: Open.

Bug

#83627 In dotnet/roslyn;

· RikkiGibson opened on May 8, 2026

·  

18.8