diff -r 45a669bad421 -r dc1ed7fe33e4 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Sun Mar 25 16:39:17 2018 +0900
+++ b/mercurial/dispatch.py	Sun Mar 25 16:35:24 2018 +0900
@@ -83,7 +83,7 @@
 
 def run():
     "run the command in sys.argv"
-    _initstdio()
+    initstdio()
     req = request(pycompat.sysargv[1:])
     err = None
     try:
@@ -112,7 +112,7 @@
     sys.exit(status & 255)
 
 if pycompat.ispy3:
-    def _initstdio():
+    def initstdio():
         pass
 
     def _silencestdio():
@@ -132,7 +132,7 @@
             except IOError:
                 pass
 else:
-    def _initstdio():
+    def initstdio():
         for fp in (sys.stdin, sys.stdout, sys.stderr):
             procutil.setbinary(fp)