tests/cases/conformance/es6/yieldExpressions/generatorTypeCheck21.ts(5,13): error TS2488: Type must have a '[Symbol.iterator]()' method that returns an iterator.


==== tests/cases/conformance/es6/yieldExpressions/generatorTypeCheck21.ts (1 errors) ====
    class Foo { x: number }
    class Bar extends Foo { y: string }
    function* g(): IterableIterator<Foo> {
        yield;
        yield * new Bar;
                ~~~~~~~
!!! error TS2488: Type must have a '[Symbol.iterator]()' method that returns an iterator.
    }