https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102869
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-11 branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:00e7d6e66638b8d2d93ff6659a140f8b3cf37aeb commit r11-9827-g00e7d6e66638b8d2d93ff6659a140f8b3cf37aeb Author: Jason Merrill <ja...@redhat.com> Date: Fri Mar 25 13:13:35 2022 -0400 c++: hash table ICE with variadic alias [PR105003] For PR104008 we thought it might be enough to keep strip_typedefs from removing this alias template specialization, but this PR demonstrates that other parts of the compiler also need to know to consider it dependent. So, this patch changes complex_alias_template_p to no longer consider template parameters used when their only use appears in a pack expansion, unless they are the parameter packs being expanded. To do that I also needed to change it to use cp_walk_tree instead of for_each_template_parm. It occurs to me that find_template_parameters should probably also use cp_walk_tree, but I'm not messing with that now. PR c++/105003 PR c++/104008 PR c++/102869 gcc/cp/ChangeLog: * pt.c (complex_alias_template_r): walk_tree callback, replacing uses_all_template_parms_r, complex_pack_expansion_r. (complex_alias_template_p): Adjust. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/variadic-alias6.C: New test. * g++.dg/cpp0x/variadic-alias7.C: New test.
