mercurial/cmdutil.py

--- a/mercurial/cmdutil.py	Mon Mar 21 21:06:49 2016 +0000
+++ b/mercurial/cmdutil.py	Thu Mar 24 00:09:58 2016 -0700
@@ -2227,8 +2227,9 @@
         'missing': graphmod.MISSINGPARENT
     }
     for name, key in edgetypes.items():
-        # experimental config: ui.graphstyle.*
-        styles[key] = ui.config('ui', 'graphstyle.%s' % name, styles[key])
+        # experimental config: experimental.graphstyle.*
+        styles[key] = ui.config('experimental', 'graphstyle.%s' % name,
+                                styles[key])
         if not styles[key]:
             styles[key] = None
     for rev, type, ctx, parents in dag: