g77 needs to support `-fpedantic' more thoroughly,
and use it only to generate
warnings instead of rejecting constructs outright.
Have it warn:
if a variable that dimensions an array is not a dummy or placed
explicitly in COMMON (F77 does not allow it to be
placed in COMMON via EQUIVALENCE); if specification statements
follow statement-function-definition statements; about all sorts of
syntactic extensions.
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