[Bug c++/104294] ICE: tree check: accessed elt 2 of 'tree_vec' with 1 elts in tsubst_pack_expansion, at cp/pt.cc:13130

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104294

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:76dc465aaf1b74bf92143510b6db5671e1c053d6

commit r12-6950-g76dc465aaf1b74bf92143510b6db5671e1c053d6
Author: Patrick Palka <ppa...@redhat.com>
Date:   Mon Jan 31 15:27:58 2022 -0500

    c++: CTAD for class tmpl defined inside partial spec [PR104294]

    Here during deduction guide generation for the nested class template
    B<char(int)>::C, the computation of outer_args yields the template
    arguments relative to the primary template for B (i.e. {char(int)})
    but what we really want is those relative to C's enclosing scope, the
    partial specialization of B (i.e. {char, int}).

            PR c++/104294

    gcc/cp/ChangeLog:

            * pt.cc (ctor_deduction_guides_for): Correct computation of
            outer_args.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/class-deduction106.C: New test.