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
|
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments.ts(18,10): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate '{ x: number; y?: number; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; z?: number; }'.
Property 'y' is missing in type '{ x: number; z?: number; }'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments.ts(19,10): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate '{ x: number; z?: number; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; y?: number; }'.
Property 'z' is missing in type '{ x: number; y?: number; }'.
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments.ts (2 errors) ====
// When a function expression is inferentially typed (section 4.9.3) and a type assigned to a parameter in that expression references type parameters for which inferences are being made,
// the corresponding inferred type arguments to become fixed and no further candidate inferences are made for them.
function foo<T>(a: (x: T) => T, b: (x: T) => T) {
var r: (x: T) => T;
return r;
}
//var r1 = foo((x: number) => 1, (x: string) => ''); // error
var r1b = foo((x) => 1, (x) => ''); // {} => {}
var r2 = foo((x: Object) => null, (x: string) => ''); // Object => Object
var r3 = foo((x: number) => 1, (x: Object) => null); // number => number
var r3ii = foo((x: number) => 1, (x: number) => 1); // number => number
var a: { x: number; y?: number; };
var b: { x: number; z?: number; };
var r4 = foo((x: typeof a) => a, (x: typeof b) => b); // typeof a => typeof a
~~~
!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
!!! error TS2453: Type argument candidate '{ x: number; y?: number; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; z?: number; }'.
!!! error TS2453: Property 'y' is missing in type '{ x: number; z?: number; }'.
var r5 = foo((x: typeof b) => b, (x: typeof a) => a); // typeof b => typeof b
~~~
!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
!!! error TS2453: Type argument candidate '{ x: number; z?: number; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; y?: number; }'.
!!! error TS2453: Property 'z' is missing in type '{ x: number; y?: number; }'.
function other<T>(x: T) {
var r6 = foo((a: T) => a, (b: T) => b); // T => T
var r6b = foo((a) => a, (b) => b); // {} => {}
}
function other2<T extends Date>(x: T) {
var r7 = foo((a: T) => a, (b: T) => b); // T => T
var r7b = foo((a) => a, (b) => b); // {} => {}
var r8 = r7(null);
// BUG 835518
//var r9 = r7(new Date());
}
function foo2<T extends Date>(a: (x: T) => T, b: (x: T) => T) {
var r: (x: T) => T;
return r;
}
function other3<T extends RegExp>(x: T) {
var r8 = foo2((a: Date) => a, (b: Date) => b); // Date => Date
}
|
