diff -r 37ea47a50875 -r cf7c88986e9f mercurial/match.py
--- a/mercurial/match.py	Sun May 28 23:51:30 2017 +0900
+++ b/mercurial/match.py	Sun May 28 23:54:31 2017 +0900
@@ -415,7 +415,8 @@
             self._files = files
         else:
             self._files = list(files)
-        self.matchfn = self.exact
+
+    matchfn = basematcher.exact
 
     @propertycache
     def _dirs(self):