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2780c209e1
An assignment to a whole polymorphic allocatable changes its dynamic type to the type of the right-hand side expression. But when the assignment is under control of a WHERE statement, or a FORALL / DO CONCURRENT with a mask expression, there is no interpretation of the assignment, as the type of a variable must be the same for all of its elements. There is no restriction in the standard against this usage, and no other Fortran compiler complains about it. But it is not possible to implement it in general, and the behavior produced by other compilers is not reasonable, much less worthy of emulating. It's best to simply disallow it with an error message. Fixes https://github.com/llvm/llvm-project/issues/133669, or more accurately, resolves it.
