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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94310] using constructor inheritance breaks the code
Date: Sun, 19 Apr 2020 04:44:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94310

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The difference stems from the fact that in this test:

template<typename>
struct B { };

template<typename... Types>
struct A : public B<Types>... {
    using B<Types>::B...; // #1
    using B<Types>::operator=3D...; // #2
};

int main() {}

when parsing B<Types> in #2 cp_parser_lookup_name finds #1, which is a
dependent USING_DECL.  strip_using_decl doesn't do anything with such a
USING_DECL, so we think that we haven't found a template name.=