[Bug fortran/70853] ICE on pointing to null, in gfc_add_block_to_block, at fortran/trans.c:1599

[anlauf at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70853

--- Comment #5 from anlauf at gcc dot gnu.org ---
Patch with slightly more user-friendly error message:

https://gcc.gnu.org/ml/fortran/2019-12/msg00159.html