File: pr79457.C

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gcc-arm-none-eabi 15%3A7-2018-q2-5
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// PR c++/79457
// { dg-do compile { target c++11 } }

template <typename T>
class Foo
{
private:
  T& goo;
  template <typename R>
  using S = decltype (goo[R ()]);

public:
  Foo (T& goo) : goo {goo} {}

  template <typename R>
  S<R> boo () {}
};

int
main ()
{
  int bar[] = {1, 2, 3};
  Foo<decltype (bar)> foo {bar};
}