=== tests/cases/conformance/es6/yieldExpressions/generatorTypeCheck3.ts ===
function* g1(): IterableIterator<string> { }
>g1 : Symbol(g1, Decl(generatorTypeCheck3.ts, 0, 0))
>IterableIterator : Symbol(IterableIterator, Decl(lib.d.ts, 1685, 1))