1 files changed, 80 insertions, 0 deletions
diff --git a/js/src/tests/js1_7/regress/regress-418641.js b/js/src/tests/js1_7/regress/regress-418641.js
new file mode 100644
index 000000000..7d194fc32
--- /dev/null
+++ b/js/src/tests/js1_7/regress/regress-418641.js
@@ -0,0 +1,80 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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 = 418641;
+var summary = '++ and -- correctness';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+ 
+function get_pre_check(operand, op)
+{
+  return "{\n"+
+    "    "+operand+" = I;\n"+
+    "    let tmp = "+op+op+operand+";\n"+
+    "    if ("+operand+" !== Number(I) "+op+" 1)\n"+
+    "        throw Error('"+op+op+operand+" case 1 for '+uneval(I));\n"+
+    "    if (tmp !== "+operand+")\n"+
+    "        throw Error('"+op+op+operand+" case 2 for '+uneval(I));\n"+
+    "}\n";    
+}
+
+function get_post_check(operand, op)
+{
+  return "{\n"+
+    "    "+operand+" = I;\n"+
+    "    let tmp = "+operand+op+op+";\n"+
+    "    if ("+operand+" !== Number(I) "+op+" 1)\n"+
+    "        throw Error('"+operand+op+op+" case 1 for '+uneval(I));\n"+
+    "    if (tmp !== Number(I))\n"+
+    "        throw Error('"+op+op+operand+" case 2 for '+uneval(I));\n"+
+    "}\n";    
+}
+
+function get_check_source(operand)
+{
+  return get_pre_check(operand, '+')+
+    get_pre_check(operand, '-')+
+    get_post_check(operand, '+')+
+    get_post_check(operand, '-');
+}
+
+var arg_check = Function('I', 'a', get_check_source('a'));
+var let_check = Function('I', 'let a;'+get_check_source('a'));
+var var_check = Function('I', 'var a;'+get_check_source('a'));
+
+var my_name;
+var my_obj = {};
+var my_index = 0;
+var name_check = Function('I', get_check_source('my_name'));
+var prop_check = Function('I', get_check_source('my_obj.x'));
+var elem_check = Function('I', get_check_source('my_obj[my_index]'));
+
+var test_values = [0 , 0.5, -0.0, (1 << 30) - 1, 1 - (1 << 30)];
+
+for (let i = 0; i != test_values.length; i = i + 1) {
+  let x = [test_values[i], String(test_values[i])];
+  for (let j = 0; j != x.length; j = j + 1) {
+    try
+    {
+      expect = actual = 'No Error';
+      let test_value = x[j];
+      arg_check(test_value, 0);
+      let_check(test_value);
+      var_check(test_value);
+      name_check(test_value);
+      prop_check(test_value);
+      elem_check(test_value);
+    }
+    catch(ex)
+    {
+      actual = ex + '';
+    }
+    reportCompare(expect, actual, summary + ': ' + i + ', ' + j);
+  }
+}