rm dead code

tulip/scope_tracker.py

@@ -4,9 +4,6 @@ import tulip.semantic as s
 from tulip.debug import debug
 debug_scope = debug.check('compiler') or debug.check('scope')
 
-SCOPE_LOCAL   = 1
-SCOPE_CLOSURE = 2
-
 class BindingTracker(object):
     def __init__(self, args, parent):
         self.args = args