# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2016-02-26 06:35:11
# Node ID f5b2b358b8b7a61389b1d33f7eb1fd581ca81aef
# Parent  b966e35aad78dfa3e132291261b7a77f4a0b9ff5

demandimport: add _imp to ignore list

Mozilla is seeing an issue with demand importing of _imp
failing in pkg_resources/__init__.py:fixup_namespace_packages.
It strangely only reproduces when using a modern version of
setuptools/pip in certain scenarios. Adding _imp to the demand import
ignore list seems to make the problem go away.

diff --git a/mercurial/demandimport.py b/mercurial/demandimport.py
--- a/mercurial/demandimport.py
+++ b/mercurial/demandimport.py
@@ -230,6 +230,8 @@ def _demandimport(name, globals=None, lo
 ignore = [
     '__future__',
     '_hashlib',
+    # ImportError during pkg_resources/__init__.py:fixup_namespace_package
+    '_imp',
     '_xmlplus',
     'fcntl',
     'win32com.gen_py',