[flang-commits] [flang] [Flang] Fix wrong compile-time error message, issue #178494. (PR #183878)

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laoshd wrote:

> As a stand-along PR, it needs a test that shows what's fixed.

A compile-time test, flang/test/Semantics/io17.f90, has been added.

https://github.com/llvm/llvm-project/pull/183878