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Subject: [Bug c++/108179] [11/12 regression] ICE related to template template
 parameters in tsubst, at cp/pt.cc:15782
Date: Wed, 26 Jul 2023 21:22:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108179

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:b3adcc60dcf3314f47f5409aecef40607f82b80b

commit r14-2809-gb3adcc60dcf3314f47f5409aecef40607f82b80b
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Jul 26 17:21:26 2023 -0400

    c++: passing partially inst tmpl as ttp [PR110566]

    Since the template arguments 'pargs' we pass to coerce_template_parms f=
rom
    coerce_template_template_parms are always a full set, we need to make s=
ure
    we always pass the parameters of the most general template because if t=
he
    template is partially instantiated then the levels won't match up.  In =
the
    testcase below during said call to coerce_template_parms the parameters=
 are
    {X, Y}, both level 1 rather than 2, and the arguments are {{int}, {N, M=
}},
    which results in a crash during auto deduction for parameters' types.

            PR c++/110566
            PR c++/108179

    gcc/cp/ChangeLog:

            * pt.cc (coerce_template_template_parms): Simplify by using
            DECL_INNERMOST_TEMPLATE_PARMS and removing redundant asserts.
            Always pass the parameters of the most general template to
            coerce_template_parms.

    gcc/testsuite/ChangeLog:

            * g++.dg/template/ttp38.C: New test.=