[Bug c++/96199] [10/11 Regression] internal compiler error: in tsubst_copy with CTAD for alias templates

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96199

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We're reaching tsubst_copy/CONST_DECL:

          /* We didn't find the name.  That should never happen; if
             name-lookup found it during preliminary parsing, we
             should find it again here during instantiation.  */
        gcc_unreachable ();