//// [FunctionDeclaration7_es6.ts]
function*bar() {
  // 'yield' here is an identifier, and not a yield expression.
  function*foo(a = yield) {
  }
}

//// [FunctionDeclaration7_es6.js]
function bar() {
    // 'yield' here is an identifier, and not a yield expression.
    function foo(a) {
        if (a === void 0) { a = yield; }
    }
}