--- a/mercurial/patch.py	Wed Mar 29 20:19:26 2017 -0700
+++ b/mercurial/patch.py	Sun Mar 26 20:52:51 2017 +0530
@@ -737,7 +737,7 @@
         for x in self.rej:
             for l in x.hunk:
                 lines.append(l)
-                if l[-1] != '\n':
+                if l[-1:] != '\n':
                     lines.append("\n\ No newline at end of file\n")
         self.backend.writerej(self.fname, len(self.rej), self.hunks, lines)