https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118104
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:6751bd4ac48a8529e2476a6848a77e81de540814 commit r15-8278-g6751bd4ac48a8529e2476a6848a77e81de540814 Author: Marek Polacek <pola...@redhat.com> Date: Mon Mar 17 12:56:40 2025 -0400 c++: ICE when substituting packs into type aliases [PR118104] r12-1094 mentions that adding the assert didn't lead to any regressions in the testsuite, but this test case demonstrates that we can reach it with valid code. Here we arrive in use_pack_expansion_extra_args_p with t which is an expansion whose pattern is void(Ts, Us) and tparm packs are {Us, Ts}, and parm_packs is { Ts -> <int, int>, Us -> <A, P...> }. We want to expand the pack into void(int, A) and void(int, P...). We compare int to A, which is fine, but then int to P... which crashes. But the code is valid so this patch removes the assert. PR c++/118104 gcc/cp/ChangeLog: * pt.cc (use_pack_expansion_extra_args_p): Remove an assert. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/alias-decl-variadic3.C: New test. Reviewed-by: Jason Merrill <ja...@redhat.com>
