This issue is mentioned in code. Related to test plan https://github.com/dotnet/roslyn/issues/81207. - [x] Error for using updated memory safety rules in older LangVer (https://github.com/dotnet/roslyn/pull/82687) - [x] Handle `new()` constraint (https://github.com/dotnet/roslyn/pull/82647) - [x] More tests (https://github.com/dotnet/roslyn/pull/82683) - [x] Add attributes to BCL (https://github.com/dotnet/runtime/issues/125134) and update roslyn to match (https://github.com/dotnet/roslyn/pull/82813)
This issue is mentioned in code.
Related to test plan #81207.
new()constraint (Unsafe evolution: handlenew()constraint #82647)