deprecated noop context managers

IPython/utils/contexts.py

@@ -2,6 +2,8 b''
 """Miscellaneous context managers.
 """
 
+import warnings
+
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
@@ -59,6 +61,13 b' class preserve_keys(object):'
 
 
 class NoOpContext(object):
-    """Context manager that does nothing."""
+    """
+    Deprecated
+    
+    Context manager that does nothing."""
+
+    def __init__(self):
+        warnings.warn("""NoOpContext is deprecated since IPython 5.0 """)
+
     def __enter__(self): pass
     def __exit__(self, type, value, traceback): pass