55 lines
3.3 KiB
Plaintext
55 lines
3.3 KiB
Plaintext
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.
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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/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.
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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/genericCallWithGenericSignatureArguments.ts (2 errors) ====
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// 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,
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// the corresponding inferred type arguments to become fixed and no further candidate inferences are made for them.
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function foo<T>(a: (x: T) => T, b: (x: T) => T) {
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var r: (x: T) => T;
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return r;
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}
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//var r1 = foo((x: number) => 1, (x: string) => ''); // error
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var r1b = foo((x) => 1, (x) => ''); // {} => {}
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var r2 = foo((x: Object) => null, (x: string) => ''); // Object => Object
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var r3 = foo((x: number) => 1, (x: Object) => null); // number => number
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var r3ii = foo((x: number) => 1, (x: number) => 1); // number => number
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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 r4 = foo((x: typeof a) => a, (x: typeof b) => b); // typeof a => typeof a
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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 r5 = foo((x: typeof b) => b, (x: typeof a) => a); // typeof b => typeof b
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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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function other<T>(x: T) {
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var r6 = foo((a: T) => a, (b: T) => b); // T => T
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var r6b = foo((a) => a, (b) => b); // {} => {}
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}
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function other2<T extends Date>(x: T) {
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var r7 = foo((a: T) => a, (b: T) => b); // T => T
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var r7b = foo((a) => a, (b) => b); // {} => {}
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var r8 = r7(null);
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// BUG 835518
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//var r9 = r7(new Date());
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}
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function foo2<T extends Date>(a: (x: T) => T, b: (x: T) => T) {
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var r: (x: T) => T;
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return r;
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}
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function other3<T extends RegExp>(x: T) {
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var r8 = foo2((a: Date) => a, (b: Date) => b); // Date => Date
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} |