tests/cases/conformance/es6/yieldExpressions/YieldExpression6_es6.ts(1,9): error TS1220: Generators are only available when targeting ECMAScript 2015 or higher.
tests/cases/conformance/es6/yieldExpressions/YieldExpression6_es6.ts(2,9): error TS2488: Type must have a '[Symbol.iterator]()' method that returns an iterator.


==== tests/cases/conformance/es6/yieldExpressions/YieldExpression6_es6.ts (2 errors) ====
    function* foo() {
            ~
!!! error TS1220: Generators are only available when targeting ECMAScript 2015 or higher.
      yield*foo
            ~~~
!!! error TS2488: Type must have a '[Symbol.iterator]()' method that returns an iterator.
    }