[Bug c++/102123] [11 Regression] Internal Compiler Error occurs during template deduction in use with templates as template parameters

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102123

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jason Merrill
<ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:e952290874d6b99946dc02e125c0fb0e9b13a1e3

commit r11-9703-ge952290874d6b99946dc02e125c0fb0e9b13a1e3
Author: Jason Merrill <ja...@redhat.com>
Date:   Sat Mar 26 23:54:22 2022 -0400

    c++: CTAD and member alias template [PR102123]

    When building a deduction guide from the Test constructor, we need to
    rewrite the use of _dummy into a dependent reference, i.e.
Test<T>::template
    _dummy.  We were using SCOPE_REF for both type and non-type templates; we
    need to use UNBOUND_CLASS_TEMPLATE for type templates.

            PR c++/102123

    gcc/cp/ChangeLog:

            * pt.c (tsubst_copy): Use make_unbound_class_template for rewriting
            a type template reference.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/class-deduction110.C: New test.