[Bug c++/122958] [13/14/15/16 Regression] internal compiler error: tree check: accessed elt 3 of 'tree_vec' with 2 elts in tsubst, at cp/pt.cc:16806

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122958

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Presumably the backport for PR c++/50852 to 4.7.3 caused the accepts-invalid
regression there (but not an ICE). That's academic now anyway, as we only need
to care about the ICE on current branches.