Nearly, but not all, other compilers have a blanket prohibition against
the use of an INTENT(OUT) dummy argument in a specification expression.
Some compilers, however, permit an INTENT(OUT) dummy argument to appear
in a specification expression in a BLOCK construct or inner procedure
via host association.
The argument some have put forth to accept this usage comes from a
reading of 10.1.11 (specification expressions) in Fortran 2023 that, if
followed consistently, would also require host-associated OPTIONAL dummy
argument to be allowed. That would be dangerous for reasons that should
be obvious.
However, I can agree that a non-OPTIONAL dummy argument can't be assumed
to remain undefined on entry to a BLOCK construct or inner procedure, so
we can accept host-associated INTENT(OUT) in specification expressions
with a portability warning.
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