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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 struct X { static const int i = I; };

constexpr A a = 42;

X x;        // OK: unique conversion to int

int ar[X::i]; // also OK

int ary[a]; // { dg-error "ambiguous|conversion|array" } ambiguous conversion