38 struct IsAContainer {  struct
39     constexpr IsAContainer() : v_{} {}  in IsAContainer()  function
71 …std::span<int>    s1{IsAContainer<int>()};          // expected-error {{no matching constructor fo…  in main()
72 …std::span<int, 0> s2{IsAContainer<int>()};          // expected-error {{no matching constructor fo…  in main()
91 …std::span<float>    s1{IsAContainer<int>()};   // expected-error {{no matching constructor for ini…  in main()
92 …std::span<float, 0> s2{IsAContainer<int>()};   // expected-error {{no matching constructor for ini…  in main()
97 …std::span<               int> s1{IsAContainer<const          int>()};   // expected-error {{no mat…  in main()
98 …std::span<               int> s2{IsAContainer<      volatile int>()};   // expected-error {{no mat…  in main()
99 …std::span<               int> s3{IsAContainer<const volatile int>()};   // expected-error {{no mat…  in main()
100 …std::span<const          int> s4{IsAContainer<      volatile int>()};   // expected-error {{no mat…  in main()
101 …std::span<const          int> s5{IsAContainer<const volatile int>()};   // expected-error {{no mat…  in main()
102 …std::span<      volatile int> s6{IsAContainer<const          int>()};   // expected-error {{no mat…  in main()
103 …std::span<      volatile int> s7{IsAContainer<const volatile int>()};   // expected-error {{no mat…  in main()
108 …std::span<               int,1> s1{IsAContainer<const          int>()}; // expected-error {{no mat…  in main()
109 …std::span<               int,1> s2{IsAContainer<      volatile int>()}; // expected-error {{no mat…  in main()
110 …std::span<               int,1> s3{IsAContainer<const volatile int>()}; // expected-error {{no mat…  in main()
111 …std::span<const          int,1> s4{IsAContainer<      volatile int>()}; // expected-error {{no mat…  in main()
112 …std::span<const          int,1> s5{IsAContainer<const volatile int>()}; // expected-error {{no mat…  in main()
113 …std::span<      volatile int,1> s6{IsAContainer<const          int>()}; // expected-error {{no mat…  in main()
114 …std::span<      volatile int,1> s7{IsAContainer<const volatile int>()}; // expected-error {{no mat…  in main()