Deprecate Bastion and rexec for 3.0.
diff --git a/Lib/Bastion.py b/Lib/Bastion.py
index 93511b0..d0dddbf 100644
--- a/Lib/Bastion.py
+++ b/Lib/Bastion.py
@@ -25,6 +25,9 @@
 bastion is created.
 
 """
+from warnings import warnpy3k
+warnpy3k("the Bastion module has been removed in Python 3.0", stacklevel=2)
+del warnpy3k
 
 __all__ = ["BastionClass", "Bastion"]