Peter Klausler 8f3357b75b [flang][runtime] Don't use -1 in I/O API for "default unit" (#76642) ...

The I/O runtime's API allows -1 to be passed for a unit number in a
READ, WRITE, or PRINT statement, where it gets replaced by 5 or 6 as
appropriate. This turns out to have been a bad idea, as it prevents the
I/O runtime from detecting and reporting a program's invalid attempt to
use -1 as an I/O unit number. So just pass 5 or 6 as appropriate.

2024-01-02 09:44:16 -08:00

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