--- a/cubicweb/_exceptions.py	Thu May 16 02:39:42 2019 +0200
+++ b/cubicweb/_exceptions.py	Thu May 16 04:47:10 2019 +0200
@@ -18,8 +18,6 @@
 """Exceptions shared by different cubicweb packages."""
 
 
-from warnings import warn
-
 from logilab.common.decorators import cachedproperty
 
 from yams import ValidationError