
PASS Has %IteratorPrototype% as prototype 
PASS next() exists and is writable, enumerable, and configurable 
PASS next() throws TypeError when called on ineligible receiver 
PASS Object.prototype.toString returns correct value 
FAIL @@toStringTag has correct value undefined is not an object (evaluating 'Object.getOwnPropertyDescriptor(iteratorProto, Symbol.toStringTag).value')
PASS Is specific to an interface