diff -r 1cb54e6193a6 -r 719b8cb22936 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Apr 13 18:17:45 2018 -0400
+++ b/mercurial/localrepo.py	Fri Apr 13 18:28:58 2018 -0400
@@ -182,7 +182,7 @@
         f = pycompat.futures.Future()
 
         try:
-            result = fn(**args)
+            result = fn(**pycompat.strkwargs(args))
         except Exception:
             pycompat.future_set_exception_info(f, sys.exc_info()[1:])
         else: