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

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In future we plan to update the workspace with the `SourceText` instances created by `didOpen` to avoid Solution snapshot duplication. Before we do so we need to change the `didOpen`...

Area-IDE
Concept-Continuous Improvement
LSP

For @cston to fill in as he does semantic model work.

Area-Compilers
untriaged

Fixes evaluation order issue identified in https://github.com/dotnet/roslyn/pull/76998#discussion_r1960623323. Also includes ref safety tests for collection expression arguments, see https://github.com/dotnet/roslyn/pull/76998#issuecomment-2672531426. Relates to test plan https://github.com/dotnet/roslyn/issues/76310

Area-Compilers
untriaged
Feature - Dictionary Expressions

VB test for https://github.com/dotnet/roslyn/pull/81531 Fixes: https://github.com/dotnet/roslyn/issues/81608

Area-IDE
VSCode

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/RefactoringError-in-Visual-Studio-when-a/11013273)._ --- \[severity:It bothers me. A fix would be nice\] _Environment_ I have a WinForms-.NET-FX 4.8.1 VB. NET-project in Visual...

Area-IDE

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/Errors-are-not-reported-in-Razor-files/10822934)._ --- [severity:It's more difficult to complete my work] [regression] For some reason VS does not show any errors in...

untriaged

Relates to test plan https://github.com/dotnet/roslyn/issues/75960

Area-Compilers
Feature - Runtime Async

``` class Program { static void Main() { System.Console.Write(Test2(new C())); } static bool Test2(C u) { return u is var (_ , (i, _)) && (int)i == 10; } static...

Area-Compilers
Feature - Pattern Matching

Fixes: https://github.com/dotnet/roslyn/issues/40773 Matches behavior of syntax token in test above

Area-Compilers
Community