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1 // PR c++/49785
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2 // { dg-do compile { target c++11 } }
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3
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4 template <typename, typename ...> struct B { };
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5 template <typename> class A;
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6
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7 template <typename R, typename ... S>
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8 struct A <R (S ...)> : public B <R, S ...>
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9 {
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10 struct C {};
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11 template <typename D> A (D, C = C ()) { }
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12 R operator () (...);
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13 };
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14
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15 template <typename R, typename ... S, typename T>
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16 auto operator >> (A <R (S ...)>, T)->A <R (S ...)>
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17 {
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18 []() {};
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19 }
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20
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21 int
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22 main ()
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23 {
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24 A <int (int, int)> a = [](int, int) {};
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25 auto b = []{};
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26 (a >> b) (3, 5);
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27 }
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