-- I've used the attr.intrinsic bit for the module symbol to
specifiy that it's an intrinsic module. Except one line in resolve.c
(see diff), it seems to be safe. However, I'd like
a) to be sure that, for every user module symbol created, the
intrinsic bit is set to 0, so that we check that a non-intrinsic and
an intrinsic module of the same name aren't used
b) the code USEing non-intrinsic modules (in module.c) to issue an
error if an intrinsic module of the same name was already USEd; ie,
I'd like the following to error out (while, with my patch, it does
not):
module iso_fortran_env
end module iso_fortran_env
program foo
use, intrinsic :: iso_fortran_env
use, non_intrinsic :: iso_fortran_env ! This should issue an error
end program foo