Fix #1679: "0x" was taken as a valid integer literal.
Fixes the tokenizer, tokenize.py and int() to reject this.
Patches by Malte Helmert.
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index d56e6ff..f7b7c0c 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -816,6 +816,11 @@
         self.assertEqual(int('0123', 0), 83)
         self.assertEqual(int('0x123', 16), 291)
 
+        # Bug 1679: "0x" is not a valid hex literal
+        self.assertRaises(ValueError, int, "0x", 16)
+        self.assertRaises(ValueError, int, "0x", 0)
+
+
         # SF bug 1334662: int(string, base) wrong answers
         # Various representations of 2**32 evaluated to 0
         # rather than 2**32 in previous versions