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

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laoshd wrote:

> What about the case of this error showing up in a character literal or named constant format?

The test, io17.f90, has been updated to cover all the cases I can think of.

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