dup-lex.js

// Copyright (C) Copyright 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 10.2.1
description: >
    It is a Syntax Error if the LexicallyDeclaredNames of ModuleItemList
    contains any duplicate entries.
flags: [module]
features: [let, const]
negative: SyntaxError
---*/

let x;
const x;