Error message fix for very old/new Python versions.

Cython/Compiler/Errors.py

@@ -48,16 +48,17 @@ class CompileError(PyrexError):
     def __init__(self, position = None, message = u""):
         self.position = position
         self.message_only = message
+        self.formatted_message = format_error(message, position)
         self.reported = False
     # Deprecated and withdrawn in 2.6:
     #   self.message = message
-        Exception.__init__(self, format_error(message, position))
+        Exception.__init__(self, self.formatted_message)
         # Python Exception subclass pickling is broken,
         # see http://bugs.python.org/issue1692335
         self.args = (position, message)
 
     def __str__(self):
-        return self.message
+        return self.formatted_message
 
 class CompileWarning(PyrexWarning):