# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 1506729142 -19800
# Node ID 05167447f90d0f1c8b0df9d4676fc498eab63e5b
# Parent  ac0cd81e2f83cd6a2910c61afbb98a415832f8e7
py3: return False early while checking whether None is a key in lazymanifest

In this patch we returns False early if we are trying to check whether None is a
key in lazymanifest. The reason I added a diff is that on Python 3, it goes into
the lazy manifest code an returns a TypeError. I checked with Durham that
whether None can be a possible key in lazymanifest and he said "no". So it's
safe to have this if statement.

This fixes `hg merge` on Python 3.

Differential Revision: https://phab.mercurial-scm.org/D852

diff -r ac0cd81e2f83 -r 05167447f90d mercurial/manifest.py
--- a/mercurial/manifest.py	Fri Sep 29 14:49:05 2017 -0700
+++ b/mercurial/manifest.py	Sat Sep 30 05:22:22 2017 +0530
@@ -442,6 +442,8 @@
         self._lm[key] = node, self.flags(key, '')
 
     def __contains__(self, key):
+        if key is None:
+            return False
         return key in self._lm
 
     def __delitem__(self, key):