[Bug fortran/83900] [8 Regression] ICE in gfc_simplify_matmul, at fortran/simplify.c:4593

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83900

--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The original test in comment 0 still fails at r256917 on darwin with

pr83900.f90:4:0:

    print *, matmul(a, b)

internal compiler error: in fold_convert_loc, at fold-const.c:2402

Should I reopen this PR or open a new one?