[Bug c++/120287] [12/13/14/15/16 Regression] internal compiler error: tree check: expected class 'type', have 'exceptional' (error_mark) in is_std_substitution, at cp/mangle.cc:507

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120287

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And with s/auto/constexpr auto/g after even more errors ICEs starting with
r5-2539-g4a4f287dc1ae6f111b28e