[Bug c++/79094] Pack expansion in using-declaration rejects an attempt to inherit a pack of constructors

[lucdanton at free dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79094

lucdanton at free dot fr changed:

           What    |Removed                     |Added
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                 CC|                            |lucdanton at free dot fr

--- Comment #1 from lucdanton at free dot fr ---
Another case that wants a dependent type expanded alongside the bases, but
where
the declarator does not name a constructor:

template<typename A, typename B>
struct unvariadic: private A, private B {
    // okay, provided A and B each declare appropriate
    // target_type and operator target_type() members
    using A::operator typename A::target_type,
          B::operator typename B::target_type;
};

template<typename... Bases>
struct variadic: private Bases... {
    // error: parameter packs not expanded with '...':
    using Bases::operator typename Bases::target_type...;
};