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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/109321] [13 Regression] ICE in iterative_hash_template_arg,
 at cp/pt.cc:1727
Date: Wed, 29 Mar 2023 02:24:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109321

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:91293ffb6af18705ab7857dc47656bdd74a9ce31

commit r13-6922-g91293ffb6af18705ab7857dc47656bdd74a9ce31
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Mar 28 17:42:23 2023 -0400

    c++: alias ctad refinements [PR109321]

    The two hunks fix missing handling demonstrated by the two testcases:
first,
    if we omit one alias template parm but include another, we need to rewr=
ite
    the deduced template args to reflect the new position of the included p=
arm.
    Second, if we can't deduce any template args for a parameter pack, it is
    deduced to an empty pack.

            PR c++/109321
            PR c++/109320

    gcc/cp/ChangeLog:

            * pt.cc (alias_ctad_tweaks): Rewrite deduced args.
            (type_targs_deducible_from): Handle null pack deduction.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/class-deduction-alias16.C: New test.
            * g++.dg/cpp2a/class-deduction-alias17.C: New test.=