Change to directly import UNBOUND.

Author: note35

Lib/concurrent/interpreters/_crossinterp.py

@@ -82,10 +82,6 @@ def __repr__(self):
                              for k, v in _UNBOUND_CONSTANT_TO_FLAG.items()}
 
 
-def register_unbound(unbound, flag):
-    _UNBOUND_CONSTANT_TO_FLAG[unbound] = flag
-
-
 def serialize_unbound(unbound):
     op = unbound
     try:

Lib/concurrent/interpreters/_queues.py

@@ -11,7 +11,7 @@
     QueueError, QueueNotFoundError,
 )
 from ._crossinterp import (
-    UNBOUND_ERROR, UNBOUND_REMOVE,
+    UNBOUND, UNBOUND_ERROR, UNBOUND_REMOVE,
 )
 
 __all__ = [
@@ -46,10 +46,6 @@ class ItemInterpreterDestroyed(QueueError,
 _PICKLED = 1
 
 
-UNBOUND = _crossinterp.UnboundItem.singleton('queue', __name__)
-_crossinterp.register_unbound(UNBOUND, 3)
-
-
 def _serialize_unbound(unbound):
     if unbound is UNBOUND:
         unbound = _crossinterp.UNBOUND