tests/cases/conformance/es6/for-ofStatements/for-of16.ts(2,11): error TS2489: An iterator must have a 'next()' method. ==== tests/cases/conformance/es6/for-ofStatements/for-of16.ts (1 errors) ==== var v: string; for (v of new StringIterator) { } // Should fail ~~~~~~~~~~~~~~~~~~ !!! error TS2489: An iterator must have a 'next()' method. class StringIterator { [Symbol.iterator]() { return this; } }