Peter Klausler 921316af6e [flang][runtime] Catch & report attempts at recursive I/O ...

When an I/O statement contains a function call that attempts
to perform I/O on the same unit, detect the recursive I/O
and terminate with a useful message rather than deadlocking in
the threading library.

Differential Revision: https://reviews.llvm.org/D131097

2022-08-07 12:52:56 -07:00

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