[Bug fortran/85448] Report binding label clash with a global identifyer

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448

--- Comment #9 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
With current trunk, I get

$ gfortran od.c odopen.f90 
$ ./a.out
 c_odopen
 odopen
unit=8 
$ gfortran od.c odopen.f90 
$ ./a.out
 c_odopen
 odopen
unit=8
$ 

which looks correct.

So, I'm going to commit a test case (better safe than sorry) and
close as fixed.