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Subject: [Bug c++/97134] partial specialization not more specialized when
 using CNTTP
Date: Tue, 13 Apr 2021 03:23:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97134

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:c755e1b3eadaf1c7e751a2c7ce1d418c6db8463a

commit r11-8145-gc755e1b3eadaf1c7e751a2c7ce1d418c6db8463a
Author: Patrick Palka <ppalka@redhat.com>
Date:   Mon Apr 12 23:22:03 2021 -0400

    c++: variadic class template placeholder deduction [PR97134]

    do_class_deduction handles specially the case where we're deducing one
    placeholder from another equivalent one, but here the initializer passed
    to do_class_deduction is wrapped in an EXPR_PACK_EXPANSION (we're being
    called from unify during get_partial_spec_bindings).  This patch makes
    do_class_deduction look through EXPR_PACK_EXPANSIONs so that we detect
    this case as well.

    gcc/cp/ChangeLog:

            PR c++/97134
            * pt.c (do_class_deduction): Look through EXPR_PACK_EXPANSION
            when checking if the initializer is an equivalent class
            placeholder template parameter.

    gcc/testsuite/ChangeLog:

            PR c++/97134
            * g++.dg/cpp2a/nontype-class43.C: New test.=