40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithObjectTypeArgsAndConstraints4.ts (3 errors) ====
|
|
// Generic call with constraints infering type parameter from object member properties
|
|
|
|
class C {
|
|
x: string;
|
|
}
|
|
|
|
class D {
|
|
x: string;
|
|
y: string;
|
|
}
|
|
|
|
function foo<T, U extends T>(t: T, t2: U) {
|
|
~~~~~~~~~~~
|
|
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
|
|
return (x: T) => t2;
|
|
}
|
|
|
|
var c: C;
|
|
var d: D;
|
|
var r = foo(c, d);
|
|
var r2 = foo(d, c); // error because C does not extend D
|
|
var r3 = foo(c, { x: '', foo: c });
|
|
var r4 = foo(null, null);
|
|
var r5 = foo({}, null);
|
|
var r6 = foo(null, {});
|
|
var r7 = foo({}, {});
|
|
var r8 = foo(() => { }, () => { });
|
|
var r9 = foo(() => { }, () => 1);
|
|
|
|
function other<T, U extends T>() {
|
|
~~~~~~~~~~~
|
|
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
|
|
var r4 = foo(c, d);
|
|
var r5 = foo<T, U>(c, d); // error
|
|
~
|
|
!!! Argument of type 'C' is not assignable to parameter of type 'T'.
|
|
}
|
|
|
|
|