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Created attachment 7408 [details]
This C# program triggers an internal error when compiled with mcs
When compiling the attached program with mcs (Mono C# compiler version 18.104.22.168) on Linux, an internal error is reported and located at the return instruction located in the class B<W>. It reads:
bug.cs(10,34): error CS0584: Internal compiler error: Cannot cast from source type to destination type.
Compilation failed: 1 error(s), 0 warnings
Fixed in master