Issue 3161: Missing import and test.
diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index 5acbb70..85d733f 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -9,6 +9,7 @@
 """
 
 from abc import ABCMeta, abstractmethod
+import sys
 
 __all__ = ["Hashable", "Iterable", "Iterator",
            "Sized", "Container", "Callable",