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

[anlauf at gmx dot de]

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

--- Comment #8 from Harald Anlauf <anlauf at gmx dot de> ---
Proposed patch posted here:

https://gcc.gnu.org/ml/fortran/2016-02/msg00026.html