File: pr52440.C

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gcc-arm-none-eabi 15%3A7-2018-q2-6
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// PR c++/52440
// { dg-do compile { target c++11 } }

template<bool>
struct V
{
  typedef void type;
};

template<typename T>
struct X
{
  template<typename>
  static constexpr bool always_true()
  {
    return true;
  }

  template<typename U,
           typename = typename V<always_true<U>()>::type>
  X(U &&) {}
};

int main()
{
  X<int> x(42);
}