Peter Klausler eac925fb81 [flang][runtime] Better handling of "fort.N" opening errors (#96347) ...

When a data transfer statement references a unit number that hasn't been
explicitly OPENed, the runtime I/O support library opens a local
"fort.N" file where N is the unit number. If that name exists in the
current working directory but is not a readable or writable file (as
appropriate), the runtime needs to catch the error at the point of the
READ or WRITE statement rather than leaving an open unit in the unit map
without a valid file descriptor.

2024-06-24 10:34:37 -07:00

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