diff -r 82ee401135dd -r a4478f74ad56 mercurial/color.py
--- a/mercurial/color.py	Sun Dec 10 04:45:10 2017 +0530
+++ b/mercurial/color.py	Sun Dec 10 04:45:27 2017 +0530
@@ -484,7 +484,7 @@
             _win32print(ui, text, writefunc, **opts)
 
     def _win32print(ui, text, writefunc, **opts):
-        label = opts.get('label', '')
+        label = opts.get(r'label', '')
         attr = origattr
 
         def mapcolor(val, attr):