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// { dg-do compile }
// { dg-options "-std=gnu++0x" }

// From N2235

// 4.5.3 constant expressions

// p 4
struct A {
  constexpr A(int i) : val(i) { }
  constexpr operator int() { return val; }
  constexpr operator long() { return -1; }
private:
  int val;
};

template<int I> struct X { static const int i = I; };
constexpr A a = 42;

X<a> x;     // OK: unique conversion to int
int ar[X<a>::i]; // also OK
int ary[a]; // { dg-error "ambiguous|conversion|array" } ambiguous conversion