[Bug c++/96199] [10/11 Regression] internal compiler error: in tsubst_copy with CTAD for alias templates

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96199

--- 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:b871301f09be7061904dc87880919d30e6afef8f

commit r11-2748-gb871301f09be7061904dc87880919d30e6afef8f
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Aug 14 18:01:27 2020 -0400

    c++: Rewrite members for all deduction guides. [PR96199]

    After the last patch, it occurred to me that we could run into the
    specialization issue with non-alias deduction guides as well, so this patch
    extends the rewriting to C++17 mode.

    Doing this revealed that we weren't properly pushing into class scope for
    normalization.

    gcc/cp/ChangeLog:

            PR c++/96199
            * pt.c (tsubst_aggr_type): Rewrite in C++17, too.
            (maybe_dependent_member_ref): Likewise.
            (build_deduction_guide): Re-substitute template parms.
            * cp-tree.h (struct push_nested_class_guard): New.
            * constraint.cc (get_normalized_constraints_from_decl): Use it.

    gcc/testsuite/ChangeLog:

            PR c++/96199
            * g++.dg/cpp1z/class-deduction-spec1.C: New test.