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Date: Mon, 15 Feb 2021 11:30:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D93787

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The problem is in count_types_test:

For 'type(*),dimension(..)', compare_type_rank_if accepts a scalar integer
For 'type(*),dimension(*)', it does not.

As 'dimension(..)' accepts scalars, the symmetry is broken.
* For count_types_test f1=3D(a,async), f2=3D(a,len,async), the check
   if (ac1 > ac2)
  is false as  ac1 < ac2
* For count_types_test f1=3D(a,len,async), f2=3D(a,async), counting
   for f1's: 'len': ac1 =3D 2 ('len', 'async' =E2=80=93 as 'a' as different=
 rank !=3D 0)
  That's fine but now:
    counting all type-rank-compatibles in f2 finds '(a,async)'
  again 2 =E2=86=92 'if (ac1 > ac2)'

(Looking through the checks, I wonder whether there is an ambiguity issue w=
ith
 dimension(*) vs. dimension(1,*) vs. dimension(1,1,*)
as one can pass to all of them any array rank, including rank=3D0 (for array
element), but I have no checked whether other checks catch this nor what the
spec says.)


In this case, a simple count of all nonoptional arguments would solve it, b=
ut I
wonder whether there are some gotchas when playing more with dimension(..) =
(and
possibly type(*) or NO_ARG_CHECK).=