//// [iteratorSpreadInCall10.ts] foo(...new SymbolIterator); function foo(s: T[]) { return s[0] } class SymbolIterator { next() { return { value: Symbol(), done: false }; } [Symbol.iterator]() { return this; } } //// [iteratorSpreadInCall10.js] foo(...new SymbolIterator); function foo(s) { return s[0]; } class SymbolIterator { next() { return { value: Symbol(), done: false }; } [Symbol.iterator]() { return this; } }