[Bug c++/79350] "explicit" deduction guides don't work

["jason at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79350

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Thu Feb  9 20:55:54 2017
New Revision: 245314

URL: https://gcc.gnu.org/viewcvs?rev=245314&root=gcc&view=rev
Log:
        PR c++/79316 - default argument in deduction guide

        PR c++/79350 - explicit deduction guide
        * parser.c (cp_parser_constructor_declarator_p)
        (cp_parser_direct_declarator): Parse deduction guides more like
        constructors.
        * cp-tree.h (enum special_function_kind): Add sfk_deduction_guide.
        * tree.c (special_function_p): Return it.
        * decl.c (check_special_function_return_type): Handle it.
        (grokdeclarator, grokfndecl): Adjust.
        (cp_finish_decl): Pass flags to do_auto_deduction.
        * error.c (dump_decl_name): Use TFF_UNQUALIFIED_NAME.
        * pt.c (dguide_name_p): Take a const_tree.
        (do_class_deduction): Handle explicit.
        (do_auto_deduction): Pass flags through.
        (build_deduction_guide): Copy explicit flag.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction27.C
    trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction28.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/error.c
    trunk/gcc/cp/parser.c
    trunk/gcc/cp/pt.c
    trunk/gcc/cp/tree.c
    trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction9.C