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Subject: [Bug c++/99844] [9/10/11 Regression] ICE: unexpected expression 'B'
 of kind template_parm_index
Date: Thu, 08 Apr 2021 11:46:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99844

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:2cd5333d16419f596d07a830bb3f1c40fa8a7b5c

commit r11-8041-g2cd5333d16419f596d07a830bb3f1c40fa8a7b5c
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Apr 7 16:44:24 2021 -0400

    c++: Fix ICE with unexpanded parameter pack [PR99844]

    In explicit17.C, we weren't detecting an unexpanded parameter pack in
    explicit(bool), so we crashed on a TEMPLATE_PARM_INDEX in constexpr.

    I noticed the same is true for noexcept(), but only since my patch to
    implement delayed parsing of noexcept.  Previously, we would detect the
    unexpanded pack in push_template_decl but now the noexcept expression
    has not yet been parsed, so we need to do it a bit later.

    gcc/cp/ChangeLog:

            PR c++/99844
            * decl.c (build_explicit_specifier): Call
            check_for_bare_parameter_packs.
            * except.c (build_noexcept_spec): Likewise.

    gcc/testsuite/ChangeLog:

            PR c++/99844
            * g++.dg/cpp2a/explicit16.C: Use c++20.
            * g++.dg/cpp0x/noexcept66.C: New test.
            * g++.dg/cpp2a/explicit17.C: New test.=