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[Bug fortran/56007] New: Remarkably bad error message with DO array=1,2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56007

             Bug #: 56007
           Summary: Remarkably bad error message with DO array=1,2
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: tobi@gcc.gnu.org


$ cat t3.f90
real iw1(90)
do iw1=1,2
end do
END 
$ gfortran t3.f90
t3.f90:2.6:

do iw1=1,2
      1
Error: Loop variable at (1) cannot be a sub-component
t3.f90:3.3:

end do
   1
Error: Expecting END PROGRAM statement at (1)
$ 

match.c has the following check in gfc_match_iterator:
  if (var->ref != NULL)
    {
      gfc_error ("Loop variable at %C cannot be a sub-component");
      goto cleanup;
    }
This assumes that all ref's are component ref's.  I verified that the bug
happens with 4.7.2, but looking at the code I would assume that this also
happens with the trunk.

This error message was mildly confusing, as I ran into this in a Fortran 77
codebase where there are no components.


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