[Bug fortran/58904] ICE: accessing a component field of an unavailable type results in a seg fault

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58904

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The change occurred between revisions r242984 (2016-11-29, ICE) and r243219
(2016-12-03, errors), likely fixed by r243020 (pr78593) for gcc7 and r243485
for gcc6.