[Bug fortran/91196] Interface generated for proc with VALUE,OPTIONAL misses hidden is-present argument

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91196

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The problem is trans-type.c's
   gfc_get_function_type()
which handles hidden strings but not the hidden is-present status of
VALUE,OPTIONAL.