https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99586
--- Comment #2 from CVS 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:cf25e27faef75e265e659f39ef6b7d0f1695dfeb commit r11-7962-gcf25e27faef75e265e659f39ef6b7d0f1695dfeb Author: Patrick Palka <ppa...@redhat.com> Date: Fri Apr 2 19:47:09 2021 -0400 c++: Refine check for CTAD placeholder [PR99586] In the below testcase, during finish_compound_literal for A<B{V}>{}, type_uses_auto finds and returns the CTAD placeholder for B{V}, which tricks us into attempting CTAD on A<B{V}>{} and leads to bogus errors. AFAICT 'type' will always be a bare 'auto' in the CTAD case so we don't need to look deeply to find it; checking template_placeholder_p instead should suffice here. gcc/cp/ChangeLog: PR c++/99586 * semantics.c (finish_compound_literal): Check template_placeholder_p instead of type_uses_auto. gcc/testsuite/ChangeLog: PR c++/99586 * g++.dg/cpp2a/nontype-class42.C: New test.
