llvm-project/clang/test/SemaTemplate/class-template-id-2.cpp

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// RUN: clang -fsyntax-only -verify %s
namespace N {
template<typename T> class A;
template<> class A<int> { };
class B : public A<int> { };
}
class C1 : public N::A<int> { };
class C2 : public N::A<float> { }; // expected-error{{base class has incomplete type}} \
// FIXME: expected-note{{forward declaration of 'class A'}}
struct D1 {
operator N::A<int>();
};
namespace N {
struct D2 {
operator A<int>();
};
}