[Bug fortran/78474] gfortran accepts invalid submodule syntax

[nick.brealey at cobham dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78474

--- Comment #1 from Nicholas Brealey <nick.brealey at cobham dot com> ---
Created attachment 40111
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40111&action=edit
example code