JSTests/test262/test/language/statements/generators/param-dflt-yield.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-generator-function-definitions
es6id: 14.4
description: >
  YieldExpression cannot be used within the FormalParameters of a generator
  function
info: |
  GeneratorDeclaration[Yield, Default] :
    function * BindingIdentifier[?Yield] ( FormalParameters[Yield] ) { GeneratorBody }

  YieldExpression cannot be used within the FormalParameters of a generator
  function because any expressions that are part of FormalParameters are
  evaluated before the resulting generator object is in a resumable state.
features: [default-parameters]
negative: SyntaxError
---*/

function* g(x = yield) {}