--- a/mercurial/patch.py	Sat Jun 16 17:36:44 2018 +0900
+++ b/mercurial/patch.py	Sat Jun 16 17:53:51 2018 +0900
@@ -707,7 +707,7 @@
         if self.eolmode != 'strict' and eol and eol != '\n':
             rawlines = []
             for l in lines:
-                if l and l[-1] == '\n':
+                if l and l.endswith('\n'):
                     l = l[:-1] + eol
                 rawlines.append(l)
             lines = rawlines