48 lines
3.3 KiB
Plaintext
48 lines
3.3 KiB
Plaintext
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3.ts(32,11): 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 '(y: string) => string' is not a valid type argument because it is not a supertype of candidate '(a: string) => boolean'.
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Type 'boolean' is not assignable to type 'string'.
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tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3.ts(33,11): error TS2453: The type argument for type parameter 'U' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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Type argument candidate '(n: Object) => number' is not a valid type argument because it is not a supertype of candidate 'number'.
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==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments3.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>(x: 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: string) => '', (x: Object) => null); // any => any
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var r1ii = foo('', (x) => '', (x) => null); // string => string
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var r2 = foo('', (x: string) => '', (x: Object) => ''); // string => string
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var r3 = foo(null, (x: Object) => '', (x: string) => ''); // Object => Object
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var r4 = foo(null, (x) => '', (x) => ''); // any => any
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var r5 = foo(new Object(), (x) => '', (x) => ''); // Object => Object
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enum E { A }
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enum F { A }
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var r6 = foo(E.A, (x: number) => E.A, (x: F) => F.A); // number => number
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function foo2<T, U>(x: T, a: (x: T) => U, b: (x: T) => U) {
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var r: (x: T) => U;
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return r;
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}
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var r8 = foo2('', (x) => '', (x) => null); // string => string
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var r9 = foo2(null, (x) => '', (x) => ''); // any => any
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var r10 = foo2(null, (x: Object) => '', (x: string) => ''); // Object => Object
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var x: (a: string) => boolean;
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var r11 = foo2(x, (a1: (y: string) => string) => (n: Object) => 1, (a2: (z: string) => string) => 2); // error
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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 '(y: string) => string' is not a valid type argument because it is not a supertype of candidate '(a: string) => boolean'.
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!!! error TS2453: Type 'boolean' is not assignable to type 'string'.
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var r12 = foo2(x, (a1: (y: string) => boolean) => (n: Object) => 1, (a2: (z: string) => boolean) => 2); // error
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~~~~
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!!! error TS2453: The type argument for type parameter 'U' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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!!! error TS2453: Type argument candidate '(n: Object) => number' is not a valid type argument because it is not a supertype of candidate 'number'. |