2014-09-12 22:35:07 +02:00
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithObjectTypeArgsAndConstraints3.ts(20,29): error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
2014-07-13 01:04:16 +02:00
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithObjectTypeArgsAndConstraints3.ts (1 errors) ====
// Generic call with constraints infering type parameter from object member properties
class Base {
x: string;
}
class Derived extends Base {
y: string;
}
class Derived2 extends Base {
z: string;
}
function f<T extends Base>(a: { x: T; y: T }) {
var r: T;
return r;
}
var r1 = f({ x: new Derived(), y: new Derived2() }); // ok, both extend Base
function f2<T extends Base, U extends { x: T; y: T }>(a: U) {
~~~~~~~~~~~~~~~~~~~~~~~~
2014-09-12 00:19:57 +02:00
!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
2014-07-13 01:04:16 +02:00
var r: T;
return r;
}
var r2 = f2({ x: new Derived(), y: new Derived2() }); // ok
var r3 = f2({ x: new Derived(), y: new Derived2() }); // ok
function f3<T extends Base>(y: (a: T) => T, x: T) {
return y(null);
}
// all ok - T gets fixed too early, but then defaults to Base and everything works out
var r4 = f3(x => x, new Base());
var r5 = f3(x => x, new Derived());
var r6 = f3(x => x, null);