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Add support for variance safety for static interface members#1343

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Add support for variance safety for static interface members#1343

RexJaeschke wants to merge1 commit intodotnet:draft-v9fromRexJaeschke:add-support-for-variance-safety-for-static-interface-members

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RexJaeschke commentedJun 9, 2025

I just discovered this V9 feature spechere. To make sure this was actually implemented in V9, I compiled the following code:

usingSystem;usingSystem.Threading.Tasks;publicinterfaceI<outT>{staticTask<T>F=Task.FromResult(default(T));// No problemstaticTask<T>P=>Task.FromResult(default(T));//CS8904 in V8 but OK in V9staticTask<T>M()=>Task.FromResult(default(T));//CS8904 in V8 but OK in V9staticeventEventHandler<T>?E;// CS8904 in V8 but OK in V9}

The errors produced by V8 donot occur in V9.

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variance safety for static interface members

4a6b7cd

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RexJaeschke added this to theC# 9.0 milestone

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RexJaeschke added the type: featureThis issue describes a new feature label

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RexJaeschke marked this pull request as draft

June 9, 2025 19:56

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