v8/test/mjsunit/es6/block-early-errors.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
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function CheckException(e) {
  var string = e.toString();
  assertInstanceof(e, SyntaxError);
}

function Check(str) {
  try {
    eval("(function () { " + str + " })");
    assertUnreachable();
  } catch (e) {
    CheckException(e);
  }
  try {
    eval("(function () { { " + str + " } })");
    assertUnreachable();
  } catch (e) {
    CheckException(e);
  }
}

// Check for early syntax errors when using let
// declarations outside of strict mode.
Check("let x;");
Check("let x = 1;");
Check("let x, y;");