[Bug fortran/70071] ICE on wrong usage of a subscript triplet

[anlauf at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70071

--- Comment #4 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Harald Anlauf from comment #3)

The patch in comment #3 regtests cleanly on i686-pc-linux-gnu
and has been posted here:

https://gcc.gnu.org/ml/fortran/2017-05/msg00010.html
https://gcc.gnu.org/ml/gcc-patches/2017-05/msg00312.html

Whoever wants to take it and adapt to 8-trunk, 7-release (?).