diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/LexicalConventions/7.9.1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/LexicalConventions/7.9.1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,124 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 402386;
+var summary = 'Automatic Semicolon insertion in postfix expressions';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var expr;
+  var code;
+
+  // LeftHandSideExpression [no LineTerminator here] ++  
+
+  code   = 'expr ++';
+  expr   = 0;
+  expect = 1;
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  code   = 'expr\n++';
+  expr   = 0;
+  expect = 'SyntaxError: syntax error';
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  // LeftHandSideExpression [no LineTerminator here] --
+
+  code   = 'expr --';
+  expr   = 0;
+  expect = -1;
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  code   = 'expr\n--';
+  expr   = 0;
+  expect = 'SyntaxError: syntax error';
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  //
+
+  var x = 1;
+  var y = 1;
+  code   = '(x\n)-- y';
+  expect = 'SyntaxError: missing ; before statement';
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  code   = '(x)-- y';
+  expect = 'SyntaxError: missing ; before statement';
+
+  try
+  {
+    eval(code);
+    actual = expr;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportCompare(expect, actual, summary + ': ' + code);
+
+  exitFunc ('test');
+}
+