1 // Copyright 2020 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 package generics
6
7 func _[A, B any](a A, b B) int {}
8 func _[T any](x, y T) T
9
10 type T[P any] struct{}
11 type T[P1, P2, P3 any] struct{}
12
13 type T[P C] struct{}
14 type T[P1, P2, P3 C] struct{}
15
16 type T[P C[P]] struct{}
17 type T[P1, P2, P3 C[P1, P2, P3]] struct{}
18
19 func f[P any](x P)
20 func f[P1, P2, P3 any](x1 P1, x2 P2, x3 P3) struct{}
21
22 func f[P interface{}](x P)
23 func f[P1, P2, P3 interface {
24 m1(P1)
25 ~P2 | ~P3
26 }](x1 P1, x2 P2, x3 P3) struct{}
27 func f[P any](T1[P], T2[P]) T3[P]
28
29 func (x T[P]) m()
30 func (T[P]) m(x T[P]) P
31
32 func _() {
33 type _ []T[P]
34 var _ []T[P]
35 _ = []T[P]{}
36 }
37
38 // type constraint literals with elided interfaces
39 func _[P ~int, Q int | string]() {}
40 func _[P struct{ f int }, Q *P]() {}
41
42 // various potentially ambiguous type parameter lists (issue #49482)
43 type _[P *T,] struct{}
44 type _[P T | T] struct{}
45 type _[P T | T | T | T] struct{}
46 type _[P *T, _ any] struct{}
47 type _[P *T,] struct{}
48 type _[P *T, _ any] struct{}
49 type _[P T] struct{}
50 type _[P T, _ any] struct{}
51
52 type _[P *struct{}] struct{}
53 type _ [P(*struct{})]struct{}
54 type _[P []int] struct{}
55
56 // a type literal in an |-expression indicates a type parameter list (blank after type parameter list and type)
57 type _[P *[]int] struct{}
58 type _[P *T | T, Q T] struct{}
59 type _[P *[]T | T] struct{}
60 type _[P *T | T | T | T | ~T] struct{}
61 type _[P *T | T | T | ~T | T] struct{}
62 type _[P *T | T | struct{} | T] struct{}
63 type _[P <-chan int] struct{}
64 type _[P *T | struct{} | T] struct{}
65
66 // a trailing comma always indicates a (possibly invalid) type parameter list (blank after type parameter list and type)
67 type _[P *T,] struct{}
68 type _[P *T | T,] struct{}
69 type _[P *T | <-T | T,] struct{}
70
71 // slice/array type declarations (no blank between array length and element type)
72 type _ []byte
73 type _ [n]byte
74 type _ [P(T)]byte
75 type _ [P((T))]byte
76 type _ [P * *T]byte
77 type _ [P * T]byte
78 type _ [P(*T)]byte
79 type _ [P(**T)]byte
80 type _ [P*T - T]byte
81 type _ [P*T - T]byte
82 type _ [P*T | T]byte
83 type _ [P*T | <-T | T]byte
84
85 // equivalent test cases for potentially ambiguous type parameter lists, except
86 // for function declarations there is no ambiguity (issue #51548)
87 func _[P *T]() {}
88 func _[P *T, _ any]() {}
89 func _[P *T]() {}
90 func _[P *T, _ any]() {}
91 func _[P T]() {}
92 func _[P T, _ any]() {}
93
94 func _[P *struct{}]() {}
95 func _[P *struct{}]() {}
96 func _[P []int]() {}
97
98 func _[P T]() {}
99 func _[P T]() {}
100 func _[P **T]() {}
101 func _[P *T]() {}
102 func _[P *T]() {}
103 func _[P **T]() {}
104 func _[P *T]() {}
105
106 func _[
107 P *T,
108 ]() {
109 }
110
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