Turn warning into error as marked in the warning message.

IPython/terminal/embed.py

@@ -89,8 +89,7 b' class InteractiveShellEmbed(TerminalInteractiveShell):'
         
     
         if kw.get('user_global_ns', None) is not None:
-            warnings.warn("user_global_ns has been replaced by user_module. The\
-                           parameter will be ignored, and removed in IPython 5.0", DeprecationWarning)
+            raise DeprecationWarning("Key word argument `user_global_ns` has been replaced by `user_module` since IPython 4.0.")
 
         self._call_location_id =  kw.pop('_call_location_id', None)
 

IPython/utils/warn.py

@@ -11,7 +11,7 b' from __future__ import print_function'
 import sys
 import warnings
 
-warnings.warn("The module IPython.utils.warn is deprecated, use the standard warnings module instead", DeprecationWarning)
+warnings.warn("The module IPython.utils.warn is deprecated since IPython 4.0, use the standard warnings module instead", DeprecationWarning)
 
 def warn(msg,level=2,exit_val=1):
     """Standard warning printer. Gives formatting consistency.
@@ -30,7 +30,7 b' def warn(msg,level=2,exit_val=1):'
     -exit_val (1): exit value returned by sys.exit() for a level 4
     warning. Ignored for all other levels."""
     
-    warnings.warn("The module IPython.utils.warn is deprecated, use the standard warnings module instead", DeprecationWarning)
+    warnings.warn("The module IPython.utils.warn is deprecated since IPython 4.0, use the standard warnings module instead", DeprecationWarning)
     if level>0:
         header = ['','','WARNING: ','ERROR: ','FATAL ERROR: ']
         print(header[level], msg, sep='', file=sys.stderr)