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[PR fortran/35832] Give better error messages for bad IO-tags



Hi,


this straightforward patch gives better error messages for malformed I/O statements, by parsing them in smaller parts. With this patch, something like
ACCESS=123
in an I/O statement is not rejected in its entirety as a syntax error, but instead an error like
Invalid value for ACCESS specification
is printed.


Built and tested on i386-darwin. Ok?

Cheers,
- Tobi


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