https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93976
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:6b161257f9f8c7a26b7d119ebc32cbbc54d2e508 commit r11-1615-g6b161257f9f8c7a26b7d119ebc32cbbc54d2e508 Author: Jason Merrill <ja...@redhat.com> Date: Mon Jun 22 15:44:45 2020 -0400 c++: Improve CTAD for aggregates [PR93976] P2082R1 adjusted the rules for class template argument deduction for an aggregate to better handle arrays and pack expansions. gcc/cp/ChangeLog: PR c++/93976 Implement C++20 P2082R1, Fixing CTAD for aggregates. * cp-tree.h (TPARMS_PRIMARY_TEMPLATE): Split out from... (DECL_PRIMARY_TEMPLATE): ...here. (builtin_guide_p): Declare. * decl.c (reshape_init_class): Handle bases of a template. (reshape_init_r): An array with dependent bound takes a single initializer. * pt.c (tsubst_default_argument): Shortcut {}. (unify_pack_expansion): Allow omitted arguments to trailing pack. (builtin_guide_p): New. (collect_ctor_idx_types): Give a trailing pack a {} default argument. Handle arrays better. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/class-deduction-aggr3.C: New test. * g++.dg/cpp2a/class-deduction-aggr4.C: New test.
