test262/test/language/module-code/early-dup-lex.js

// Copyright (C) 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:
  phase: early
  type: SyntaxError
---*/

throw "Test262: This statement should not be evaluated.";

let x;
const x;