# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 2017-03-26 08:12:06
# Node ID 6ceb3c4c3ab6e4caf68c3ba0909878896af0faac
# Parent  addc392cc3d347749125775e078c9279a032b873

py3: fix slicing of byte string in revlog.compress()

I tried .startswith('\0'), but data wasn't always a bytes nor a bytearray.

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1488,7 +1488,7 @@ class revlog(object):
             # The revlog compressor added the header in the returned data.
             return '', compressed
 
-        if data[0] == '\0':
+        if data[0:1] == '\0':
             return '', data
         return 'u', data