[Clang] Update warning on some designator initializer cases involving unions Currently when using designated initializers in C++ we have a few extension. Two extension which are dangerous involved assigning to multiple members of union which will likely be a mistake since unions can only have one active member. I have updated to be a warning by default. The second case if when we assign to multiple union members and one of the previous members had a non-trivial destructor, which could lead to leaking resources. This one is now an error by default. Fixes: https://github.com/llvm/llvm-project/issues/62156 Differential Revision: https://reviews.llvm.org/D149694
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