// RUN: %clang_cc1 -std=c++11 -verify %s struct A { constexpr A(const int&) : rval(false) {} constexpr A(const int&&) : rval(true) {} bool rval; }; struct B : A { using A::A; }; constexpr int k = 0; constexpr A a0{0}; constexpr A a1{k}; constexpr B b0{0}; // This performs static_cast<(const int&)&&>(k), so calls the A(const int&) // constructor. constexpr B b1{k}; static_assert(a0.rval && !a1.rval && b0.rval && !b1.rval, ""); struct C { template<typename T> constexpr C(T t) : v(t) {} int v; }; struct D : C { using C::C; }; static_assert(D(123).v == 123, ""); // FIXME: This diagnostic sucks. template<typename T> constexpr D::D(T t) : C(t) {} // expected-error {{definition of implicitly declared function}}