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tests/cases/compiler/promisesWithConstraints.ts(15,1): error TS2322: Type 'Promise<Foo>' is not assignable to type 'Promise<Bar>'.
Property 'y' is missing in type 'Foo' but required in type 'Bar'.
tests/cases/compiler/promisesWithConstraints.ts(20,1): error TS2322: Type 'CPromise<Foo>' is not assignable to type 'CPromise<Bar>'.
Type 'Foo' is not assignable to type 'Bar'.
==== tests/cases/compiler/promisesWithConstraints.ts (2 errors) ====
interface Promise<T> {
then<U>(cb: (x: T) => Promise<U>): Promise<U>;
}
interface CPromise<T extends { x: any; }> {
then<U extends { x: any; }>(cb: (x: T) => Promise<U>): Promise<U>;
}
interface Foo { x; }
interface Bar { x; y; }
var a: Promise<Foo>;
var b: Promise<Bar>;
a = b; // ok
b = a; // ok
~
!!! error TS2322: Type 'Promise<Foo>' is not assignable to type 'Promise<Bar>'.
!!! error TS2322: Property 'y' is missing in type 'Foo' but required in type 'Bar'.
!!! related TS2728 tests/cases/compiler/promisesWithConstraints.ts:10:20: 'y' is declared here.
var a2: CPromise<Foo>;
var b2: CPromise<Bar>;
a2 = b2; // ok
b2 = a2; // was error
~~
!!! error TS2322: Type 'CPromise<Foo>' is not assignable to type 'CPromise<Bar>'.
!!! error TS2322: Type 'Foo' is not assignable to type 'Bar'.
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