1 // PR c++/93907 2 // { dg-options -std=gnu++20 } 3 4 template <int a> struct c { 5 static constexpr int d = a; 6 typedef c e; 7 }; 8 template <typename> struct f; 9 template <typename b> using g = typename f<b>::e; 10 struct b; 11 template <typename b> struct f { using e = b; }; 12 template <typename ai> struct m { typedef g<ai> aj; }; 13 template <typename b> struct n { typedef typename m<b>::aj e; }; 14 template <typename b> using an = typename n<b>::e; 15 template <typename> constexpr bool ao = c<true>::d; 16 template <typename> constexpr bool i = c<1>::d; 17 template <typename> concept bb = i<b>; 18 #ifdef __SIZEOF_INT128__ 19 using cc = __int128; 20 #else 21 using cc = long long; 22 #endif 23 template <typename> concept cd = bb<cc>; 24 template <typename bt> concept ce = requires { requires cd<bt>; }; 25 template <typename bt> concept h = ce<bt>; 26 template <typename bt> concept l = h<bt>; 27 template <typename> concept cl = ao<b>; requires(b j)28template <typename b> concept cp = requires(b j) { 29 requires h<an<decltype(j.begin())>>; 30 }; 31 struct o { operatoro32 template <cl b> requires cp<b> auto operator()(b) {} 33 }; 34 template <typename b> using cm = decltype(o{}(b())); 35 template <typename bt> concept ct = l<bt>; 36 template <typename da> concept dd = ct<cm<da>>; 37 template <typename da> concept de = dd<da>; 38 struct { 39 template <de da, typename b> void operator()(da, b); 40 } di; 41 struct p { 42 void begin(); 43 }; 44 template <typename> using df = p; q()45template <int> void q() { 46 df<int> k; 47 int d; 48 di(k, d); 49 } 50