1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
=== tests/cases/conformance/types/typeParameters/typeArgumentLists/typeParameterAsTypeParameterConstraint.ts ===
// using a type parameter as a constraint for a type parameter is valid
// no errors expected except illegal constraints
function foo<T, U extends T>(x: T, y: U): U { return y; }
>foo : <T, U extends T>(x: T, y: U) => U
>x : T
>y : U
>y : U
var r = foo(1, 2);
>r : number
>foo(1, 2) : 2
>foo : <T, U extends T>(x: T, y: U) => U
>1 : 1
>2 : 2
var r = foo({}, 1);
>r : number
>foo({}, 1) : 1
>foo : <T, U extends T>(x: T, y: U) => U
>{} : {}
>1 : 1
interface A {
foo: string;
>foo : string
}
interface B extends A {
bar: number;
>bar : number
}
var a: A;
>a : A
var b: B;
>b : B
var r2 = foo(a, b);
>r2 : B
>foo(a, b) : B
>foo : <T, U extends T>(x: T, y: U) => U
>a : A
>b : B
var r3 = foo({ x: 1 }, { x: 2, y: 3 });
>r3 : { x: number; y: number; }
>foo({ x: 1 }, { x: 2, y: 3 }) : { x: number; y: number; }
>foo : <T, U extends T>(x: T, y: U) => U
>{ x: 1 } : { x: number; }
>x : number
>1 : 1
>{ x: 2, y: 3 } : { x: number; y: number; }
>x : number
>2 : 2
>y : number
>3 : 3
function foo2<T, U extends { length: T }>(x: T, y: U) { return y; }
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>length : T
>x : T
>y : U
>y : U
foo2(1, '');
>foo2(1, '') : ""
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>1 : 1
>'' : ""
foo2({}, { length: 2 });
>foo2({}, { length: 2 }) : { length: number; }
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>{} : {}
>{ length: 2 } : { length: number; }
>length : number
>2 : 2
foo2(1, { width: 3, length: 2 });
>foo2(1, { width: 3, length: 2 }) : { width: number; length: number; }
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>1 : 1
>{ width: 3, length: 2 } : { width: number; length: number; }
>width : number
>3 : 3
>length : number
>2 : 2
foo2(1, []);
>foo2(1, []) : any[]
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>1 : 1
>[] : undefined[]
foo2(1, ['']);
>foo2(1, ['']) : string[]
>foo2 : <T, U extends { length: T; }>(x: T, y: U) => U
>1 : 1
>[''] : string[]
>'' : ""
|
