https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66544
--- Comment #5 from janus at gcc dot gnu.org ---
Note that there are other ways to generate a "recursive" interface, like:
module m
implicit none
contains
real function f(z)
procedure(f), pointer :: z
end
end module
This one is compiled just fine by gfortran.
There is also the very closely related PR54107, which is fixed already. From
the discussion there it sounds like self-referential interfaces are legal in
principle.
