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// PR c++/51047

// { dg-options -std=c++0x }

template T &&declval();

template decltype(declval().x) f(T *);

template char f(T);

struct B1{ int x; };

struct B2{ int x; };

struct D : public B1, B2{};

struct S { int x; };

int main()

{

  S *p = nullptr;

  static_assert(sizeof(f(p)) == sizeof(int), "");

  D *q = nullptr;

  static_assert(sizeof(f(q)) == 1u, "");

}