[Bug fortran/87734] [7/8/9 Regression] ICE in is_illegal_recursion check for character len= parameter

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87734

--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Would be useful to find out which commit triggered this change ...

Revision r267783 (pr88376) seems to be a good suspect.