1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
tests/cases/compiler/typeArgumentInferenceWithConstraintAsCommonRoot.ts(7,1): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate 'Giraffe' is not a valid type argument because it is not a supertype of candidate 'Elephant'.
Property 'y' is missing in type 'Elephant'.
==== tests/cases/compiler/typeArgumentInferenceWithConstraintAsCommonRoot.ts (1 errors) ====
interface Animal { x }
interface Giraffe extends Animal { y }
interface Elephant extends Animal { z }
function f<T extends Animal>(x: T, y: T): T { return undefined; }
var g: Giraffe;
var e: Elephant;
f(g, e); // valid because both Giraffe and Elephant satisfy the constraint. T is Animal
~
!!! 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 'Giraffe' is not a valid type argument because it is not a supertype of candidate 'Elephant'.
!!! error TS2453: Property 'y' is missing in type 'Elephant'.
|
