[llvm-bugs] [Bug 45801] New: The using declaration doesn't work for parent class' constructors.

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https://bugs.llvm.org/show_bug.cgi?id=45801

            Bug ID: 45801
           Summary: The using declaration doesn't work for parent class'
                    constructors.
           Product: clang
           Version: 10.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 312988336 at qq.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following code works in GCC 9.3 and MSVC v19.24, but fails in Clang 10.0.0
(adding the typename keyword resolves that issue, but Clang has other problems
that GCC does not).

==================
template<typename>
struct A
{
    int n;

    A(bool)
    {}
};

template<typename>
struct B
{
    struct C : A<B>
    {
        using Base = A<B>;

        using A<B>::A; // ok
        using Base::n; // ok

        // error: dependent using declaration resolved to type without
'typename'
        using Base::A;
    };

    C get() const
    {
        return C(true);
    }
};

int main()
{
    auto b = B<int>();
    b.get();
}

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