61 struct AssignableFrom {  struct
72   AssignableFrom() = default;  argument
74   explicit AssignableFrom(T) { ++type_constructed; }  in AssignableFrom()  function
75   AssignableFrom& operator=(T) { ++type_assigned; return *this; }  in operator =()  argument
77   AssignableFrom(int) { ++int_constructed; }  in AssignableFrom()  argument
78   AssignableFrom& operator=(int) { ++int_assigned; return *this; }  in operator =()  argument
80   AssignableFrom(AssignableFrom const&) = delete;
81   AssignableFrom& operator=(AssignableFrom const&) = delete;
84 template <class T> int AssignableFrom<T>::type_constructed = 0;
85 template <class T> int AssignableFrom<T>::type_assigned = 0;
86 template <class T> int AssignableFrom<T>::int_constructed = 0;
87 template <class T> int AssignableFrom<T>::int_assigned = 0;
156         using T = AssignableFrom<OptInt&&>;  in test_ambiguous_assign()
175         using T = AssignableFrom<OptInt const&&>;  in test_ambiguous_assign()