[Bug fortran/77583] ICE in pp_quoted_string, at pretty-print.c:966

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77583

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Patch at https://gcc.gnu.org/ml/fortran/2019-03/msg00007.html and it has been
approved.