1 // RUN: %clang_cc1 -std=c++2a -x c++ -verify %s
2 
3 template<typename T> requires (sizeof(T) >= 4)
4 // expected-note@-1{{similar constraint expressions not considered equivalent}}
5 bool a = false; // expected-note{{template is declared here}}
6 
7 template<typename T> requires (sizeof(T) >= 4 && sizeof(T) <= 10)
8 // expected-note@-1{{similar constraint expression here}}
9 bool a<T> = true; // expected-error{{variable template partial specialization is not more specialized than the primary template}}
10 
11 template<typename T>
12 concept C1 = sizeof(T) >= 4;
13 
14 template<typename T> requires C1<T>
15 bool b = false;
16 
17 template<typename T> requires (C1<T> && sizeof(T) <= 10)
18 bool b<T> = true;
19 
20 template<typename T>
21 concept C2 = sizeof(T) > 1 && sizeof(T) <= 8;
22 
23 template<typename T>
24 bool c = false;
25 
26 template<typename T> requires C1<T>
27 bool c<T> = true;
28 
29 template<typename T>
30 bool d = false;
31 
32 template<typename T>
33 bool d<T> = true; // expected-error{{variable template partial specialization does not specialize any template argument; to define the primary template, remove the template argument list}}
34 
35 template<typename T> requires C1<T>
36 bool e = false;
37 
38 template<typename T>
39 bool e<T> = true; // expected-error{{variable template partial specialization does not specialize any template argument; to define the primary template, remove the template argument list}}
40 
41 template<typename T>
42 constexpr int f = 1;
43 
44 template<typename T> requires C1<T> && C2<T>
45 constexpr int f<T> = 2;
46 
47 template<typename T> requires C1<T> || C2<T>
48 constexpr int f<T> = 3;
49 
50 static_assert(f<unsigned> == 2);
51 static_assert(f<char[10]> == 3);
52 static_assert(f<char> == 1);
53 
54 template <int I>
55 struct S {
56   template <typename T>
57   static constexpr int f = 1;
58 
59   template <typename T>
60     requires C1<T> && C2<T>
61   static constexpr int f<T> = 2;
62 
63   template <typename T>
64     requires C1<T> || C2<T>
65   static constexpr int f<T> = 3;
66 };
67 
68 static_assert(S<1>::f<unsigned> == 2);
69 static_assert(S<1>::f<char[10]> == 3);
70 static_assert(S<1>::f<char> == 1);
71