[Bug fortran/69064] Unhelpful error message when a module variable was not included in the only list

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69064

--- Comment #31 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Sorry but what you provide is useless for the time I want to spend on this PR
(you should use 'tar' for many files, so far son_struct_mod.mod is missing).
Please provide a reduced test.