44 lines
No EOL
2.6 KiB
Text
44 lines
No EOL
2.6 KiB
Text
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithNonSymmetricSubtypes.ts(12,9): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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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; }'.
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tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithNonSymmetricSubtypes.ts(13,10): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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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; }'.
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==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithNonSymmetricSubtypes.ts (2 errors) ====
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// generic type argument inference where inference leads to two candidates that are both supertypes of all candidates
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// we choose the first candidate so the result is dependent on the order of the arguments provided
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function foo<T>(x: T, y: T) {
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var r: T;
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return r;
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}
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var a: { x: number; y?: number; };
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var b: { x: number; z?: number; };
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var r = foo(a, b); // { x: number; y?: number; };
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~~~
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!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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!!! 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; }'.
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var r2 = foo(b, a); // { x: number; z?: number; };
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~~~
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!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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!!! 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; }'.
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var x: { x: number; };
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var y: { x?: number; };
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var r3 = foo(a, x); // { x: number; y?: number; };
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var r4 = foo(x, a); // { x: number; };
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var r5 = foo(a, y); // { x?: number; };
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var r5 = foo(y, a); // { x?: number; };
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var r6 = foo(x, y); // { x?: number; };
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var r6 = foo(y, x); // { x?: number; };
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var s1: (x: Object) => string;
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var s2: (x: string) => string;
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var r7 = foo(s1, s2); // (x: Object) => string;
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var r8 = foo(s2, s1); // (x: string) => string; |