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// PR c++/51489
// DR 1313
// { dg-options "-std=c++0x" }

struct array
{
  constexpr array() :x(0) {}
  constexpr int const* begin() { return &x; }
  int x;
};
constexpr array aa;
constexpr auto b = aa.begin();
static_assert(b-b == 0, "compiles just fine");
static_assert(aa.begin()-aa.begin() == 0, "compiler thinks it's not a constant expression");