[Bug c++/103852] [10/11/12 Regression] Alias template argument deduction is available in C++17 mode

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103852

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:5d583d24200ac33a1cb281b7ddee9aad351151b5

commit r12-7998-g5d583d24200ac33a1cb281b7ddee9aad351151b5
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Apr 4 11:56:38 2022 -0400

    c++: alias template equivalence and CTAD [PR103852]

    I had been thinking about DR1286 "equivalence" as meaning generally
    interchangeable, but looking back at the proposed resolution in the context
    of this PR, I see that it's just about use as a template argument.  So
let's
    give a pedwarn if we look through a renaming alias.

            PR c++/103852
            DR 1286

    gcc/cp/ChangeLog:

            * pt.cc (do_class_deduction): Pedwarn for renaming alias in C++17.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/class-deduction-alias1.C: Expect warning.