diff -r 9c647f427aef -r 52e5f68d8363 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Thu Jun 18 23:08:27 2015 +0900
+++ b/mercurial/scmutil.py	Fri Jun 19 11:19:45 2015 -0700
@@ -10,7 +10,7 @@
 import util, error, osutil, revset, similar, encoding, phases
 import pathutil
 import match as matchmod
-import os, errno, re, glob, tempfile, shutil, stat, inspect
+import os, errno, re, glob, tempfile, shutil, stat
 
 if os.name == 'nt':
     import scmwindows as scmplatform
@@ -187,16 +187,6 @@
         self._loweredfiles.add(fl)
         self._newfiles.add(f)
 
-def develwarn(tui, msg):
-    """issue a developer warning message"""
-    msg = 'devel-warn: ' + msg
-    if tui.tracebackflag:
-        util.debugstacktrace(msg, 2)
-    else:
-        curframe = inspect.currentframe()
-        calframe = inspect.getouterframes(curframe, 2)
-        tui.write_err('%s at: %s:%s (%s)\n' % ((msg,) + calframe[2][1:4]))
-
 def filteredhash(repo, maxrev):
     """build hash of filtered revisions in the current repoview.