[Bug c++/120136] [13/14/15/16 Regression] internal compiler error: tree check: accessed elt 1 of 'tree_vec' with -1 elts in add_to_template_args, at cp/pt.cc:612

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120136

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 63562
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63562&action=edit
Slightly more reduced

Note commenting out the unused template variable definition:
    template <car auto c> foo<c> foobar;

Will also fix the ICE on the trunk.