Similar to core issue 591 and CODEGEN-3963, this core issue resolves a lookup issue in a function template. In the following source code, the struct 'A' will examine the scope of the base class D<T> to resolve the unqualified reference to B, when the core issue resolution states that D<T> should be skipped and the B found in the function template 'g' should be used instead. struct B{ void f(int); }; template<class T> struct D: B { }; template<class T> void g() {    struct B { void f(); };    struct A : D<T> {        B m;    };    A a;    a.m.f(); // Presumably, we want ::g()::B::f(), not ::B::f(int) } int main () {    g<int>();    return 0; }