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tests/cases/compiler/promiseIdentityWithConstraints.ts(10,5): error TS2403: Subsequent variable declarations must have the same type. Variable 'x' must be of type 'IPromise<string, number>', but here has type 'Promise<string, boolean>'.
==== tests/cases/compiler/promiseIdentityWithConstraints.ts (1 errors) ====
export interface IPromise<T, V> {
then<U extends T, W extends V>(callback: (x: T) => IPromise<U, W>): IPromise<U, W>;
}
export interface Promise<T, V> {
then<U extends T, W extends V>(callback: (x: T) => Promise<U, W>): Promise<U, W>;
}
// Error because constraint V doesn't match
var x: IPromise<string, number>;
var x: Promise<string, boolean>;
~
!!! error TS2403: Subsequent variable declarations must have the same type. Variable 'x' must be of type 'IPromise<string, number>', but here has type 'Promise<string, boolean>'.
!!! related TS6203 tests/cases/compiler/promiseIdentityWithConstraints.ts:9:5: 'x' was also declared here.
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