diff -r dddf53473315 -r 7d1798ec92a3 contrib/check-code.py
--- a/contrib/check-code.py	Mon Feb 04 09:37:09 2019 -0800
+++ b/contrib/check-code.py	Mon Feb 04 09:38:33 2019 -0800
@@ -414,7 +414,7 @@
 
 txtpats = [
   [
-    ('\s$', 'trailing whitespace'),
+    (r'\s$', 'trailing whitespace'),
     ('.. note::[ \n][^\n]', 'add two newlines after note::')
   ],
   []