https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121795
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:8e3230f4fed0d41e790d68c2534c057911bab35c commit r16-3832-g8e3230f4fed0d41e790d68c2534c057911bab35c Author: Patrick Palka <ppa...@redhat.com> Date: Fri Sep 12 14:21:25 2025 -0400 c++: pack indexing is a non-deduced context [PR121795] We weren't explicitly treating a pack index specifier as a non-deduced context (as per [temp.deduct.type]/5), leading to an ICE for the first testcase below. PR c++/121795 gcc/cp/ChangeLog: * pt.cc (unify) <case PACK_INDEX_TYPE>: New non-deduced context case. gcc/testsuite/ChangeLog: * g++.dg/cpp26/pack-indexing17.C: New test. * g++.dg/cpp26/pack-indexing17a.C: New test. Reviewed-by: Marek Polacek <pola...@redhat.com> Reviewed-by: Jason Merrill <ja...@redhat.com>
