# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 2018-08-08 00:17:01
# Node ID 32b1967b873445ac215ea3f381075dcf51a10f29
# Parent  1601afbb573c771c5943256debe3c36718f4c6d4

linelog: extract `len(self._program)` to a local function

This is a micro optimization prepared for following changes where
`len(self._program)` is used in a loop.

Differential Revision: https://phab.mercurial-scm.org/D4149

diff --git a/mercurial/linelog.py b/mercurial/linelog.py
--- a/mercurial/linelog.py
+++ b/mercurial/linelog.py
@@ -308,7 +308,8 @@ class linelog(object):
         else:
             a1info = ar.lines[a1]
             a1inst = self._program[a1info._offset]
-        oldproglen = len(self._program)
+        programlen = self._program.__len__
+        oldproglen = programlen()
         appendinst = self._program.append
 
         # insert