tests/cases/conformance/es6/yieldExpressions/YieldExpression3_es6.ts(1,9): error TS1220: Generators are only available when targeting ECMAScript 6 or higher.
==== tests/cases/conformance/es6/yieldExpressions/YieldExpression3_es6.ts (1 errors) ====
function* foo() {
~
!!! error TS1220: Generators are only available when targeting ECMAScript 6 or higher.
yield
}