https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97122
--- Comment #7 from kargl at gcc dot gnu.org --- (In reply to kargl from comment #5) > (In reply to Paul Thomas from comment #3) > > > > I have marked this as "waiting" pending a contrary interpretation. > > > > Cheers > > > > Paul, > > I asked on the J3 mailing list about the code. > > https://mailman.j3-fortran.org/pipermail/j3/2023-May/014193.html I haven't had a response from a current member of J3. Bob Corbett, a former member, believes the code is valid Fortran. Jeff Hammond notes that Cray Fortran compiled the code. So, we have Cray, Intel compile the code. NAG and gfortran reject it. I'm not sure if there are any other compilers with submodule support.