[Bug c++/81718] g++ segfault in tsubst_copy_and_build when creating type alias

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81718

--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
> 
> I would have to rebuild my gcc with debug info to get a better backtrace.

So I tried doing that but it crashed my debugger; I might need to open a
separate bug for that...