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tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(10,29): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate 'number' is not a valid type argument because it is not a supertype of candidate 'string'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(15,21): error TS2345: Argument of type 'Date' is not assignable to parameter of type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(16,22): error TS2345: Argument of type '1' is not assignable to parameter of type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(25,23): error TS2345: Argument of type '(a: T) => T' is not assignable to parameter of type '(x: Date) => Date'.
Types of parameters 'a' and 'x' are incompatible.
Type 'Date' is not assignable to type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(37,36): error TS2345: Argument of type '(x: E) => F' is not assignable to parameter of type '(x: E) => E'.
Type 'F' is not assignable to type 'E'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(50,21): error TS2345: Argument of type 'Date' is not assignable to parameter of type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(51,22): error TS2345: Argument of type '1' is not assignable to parameter of type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(60,23): error TS2345: Argument of type '(a: T) => T' is not assignable to parameter of type '(x: Date) => Date'.
Types of parameters 'a' and 'x' are incompatible.
Type 'Date' is not assignable to type 'T'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(67,51): error TS2304: Cannot find name 'U'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts(67,57): error TS2304: Cannot find name 'U'.
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithGenericSignatureArguments2.ts (10 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.
module onlyT {
function foo<T>(a: (x: T) => T, b: (x: T) => T) {
var r: (x: T) => T;
return r;
}
var r1: (x: {}) => {} = foo((x: number) => 1, (x: string) => '');
~~~
!!! 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 'number' is not a valid type argument because it is not a supertype of candidate 'string'.
function other2<T extends Date>(x: T) {
var r7 = foo((a: T) => a, (b: T) => b); // T => T
// BUG 835518
var r9 = r7(new Date()); // should be ok
~~~~~~~~~~
!!! error TS2345: Argument of type 'Date' is not assignable to parameter of type 'T'.
var r10 = r7(1); // error
~
!!! error TS2345: Argument of type '1' is not assignable to parameter of type 'T'.
}
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 r7 = foo2((a: T) => a, (b: T) => b); // error
~~~~~~~~~~~
!!! error TS2345: Argument of type '(a: T) => T' is not assignable to parameter of type '(x: Date) => Date'.
!!! error TS2345: Types of parameters 'a' and 'x' are incompatible.
!!! error TS2345: Type 'Date' is not assignable to type 'T'.
var r7b = foo2((a) => a, (b) => b); // valid, T is inferred to be Date
}
enum E { A }
enum F { A }
function foo3<T>(x: T, a: (x: T) => T, b: (x: T) => T) {
var r: (x: T) => T;
return r;
}
var r7 = foo3(E.A, (x) => E.A, (x) => F.A); // error
~~~~~~~~~~
!!! error TS2345: Argument of type '(x: E) => F' is not assignable to parameter of type '(x: E) => E'.
!!! error TS2345: Type 'F' is not assignable to type 'E'.
}
module TU {
function foo<T, U>(a: (x: T) => T, b: (x: U) => U) {
var r: (x: T) => T;
return r;
}
var r1: (x: {}) => {} = foo((x: number) => 1, (x: string) => '');
function other2<T extends Date>(x: T) {
var r7 = foo((a: T) => a, (b: T) => b);
var r9 = r7(new Date());
~~~~~~~~~~
!!! error TS2345: Argument of type 'Date' is not assignable to parameter of type 'T'.
var r10 = r7(1);
~
!!! error TS2345: Argument of type '1' is not assignable to parameter of type 'T'.
}
function foo2<T extends Date, U extends Date>(a: (x: T) => T, b: (x: U) => U) {
var r: (x: T) => T;
return r;
}
function other3<T extends RegExp>(x: T) {
var r7 = foo2((a: T) => a, (b: T) => b);
~~~~~~~~~~~
!!! error TS2345: Argument of type '(a: T) => T' is not assignable to parameter of type '(x: Date) => Date'.
!!! error TS2345: Types of parameters 'a' and 'x' are incompatible.
!!! error TS2345: Type 'Date' is not assignable to type 'T'.
var r7b = foo2((a) => a, (b) => b);
}
enum E { A }
enum F { A }
function foo3<T>(x: T, a: (x: T) => T, b: (x: U) => U) {
~
!!! error TS2304: Cannot find name 'U'.
~
!!! error TS2304: Cannot find name 'U'.
var r: (x: T) => T;
return r;
}
var r7 = foo3(E.A, (x) => E.A, (x) => F.A);
}
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