test262/test/language/block-scope/syntax/for-in/disallow-initialization-assignment.js

// Copyright (C) 2011 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 13.1
description: >
    for declaration:
    disallow initialization assignment
negative:
  phase: early
  type: SyntaxError
---*/
for (let x = 3 in {}) { }