[Bug c++/70449] [6 Regression] ICE with -Wall on valid code on x86_64-linux-gnu in pp_string, at pretty-print.c:928

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70449

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
In print_instantiation_full_context:
3315       pp_verbatim (context->printer,
3316                    TREE_CODE (p->decl) == TREE_LIST
3317                    ? _("%s: In substitution of %qS:\n")
3318                    : _("%s: In instantiation of %q#D:\n"),
3319                    LOCATION_FILE (location),
3320                    p->decl);
but location == UNKNOWN_LOCATION here.