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Siegfried Pammer
3e45005ebd
C# 12 allows both on the explicitly typed parameter list of a lambda, and nowhere else: an anonymous method cannot declare either, and neither can a lambda whose parameter list is about to be dropped. Guarded by a setting so the output stays valid for earlier language versions. Only what the anonymous function's own metadata declares is written. A lambda may state a default the delegate does not have, a different one, or none where the delegate has one, and reflection over the lambda's method reports what the lambda declared - so filling either in from the delegate's Invoke would make the recompiled assembly describe itself differently from the original. Call sites are unaffected either way, because they bind against the delegate, which still declares both. Roslyn writes ParamArrayAttribute on the anonymous function's own method only from version 5 on; before that it stands on the delegate type alone, where it is not the lambda's to restate, so the fixture guards those cases on ROSLYN5. The correctness test reads the metadata back through reflection, which is the only place the difference is observable. Assisted-by: Claude:claude-opus-5[1m]:Claude Code
