diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma/Number/0x-without-following-hexdigits.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma/Number/0x-without-following-hexdigits.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 582643;
+var summary = "'0x' not followed by hex digits should be a syntax error";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+try
+{
+  eval("0x");
+  throw new Error("didn't throw parsing 0x (with no subsequent hex digits)");
+}
+catch (e)
+{
+  assertEq(e instanceof SyntaxError, true,
+           "bad exception thrown: " + e);
+}
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");