https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102643
Patrick Palka <ppalka at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2021-10-11 Status|UNCONFIRMED |ASSIGNED Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org --- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> --- Reduced testcase (needs a checking compiler to reliably crash): template<class _Tp, class = int> struct vector { typedef int allocator_type; vector(_Tp, allocator_type = allocator_type()); }; template<class T> using vector_mm = vector<T>; vector_mm v(0); I suppose we should add this testcase to the testsuite before closing the PR.