selector2: vendor selector2 library This library was a backport of the Python 3 "selectors" library. It is useful to provide a better selector interface for Python2, to address some issues of the plain old select.select, mentioned in the next patch. The code [1] was ported using the MIT license, with some minor modifications to make our test happy: 1. "# no-check-code" was added since it's foreign code. 2. "from __future__ import absolute_import" was added. 3. "from collections import namedtuple, Mapping" changed to avoid direct symbol import. [1]: https://github.com/SethMichaelLarson/selectors2/blob/d27dbd2fdc48331fb76ed431f44b6e6956de7f82/selectors2.py # no-check-commit

--- a/tests/test-check-code.t	Tue Jul 11 00:40:29 2017 -0400
+++ b/tests/test-check-code.t	Fri Jul 14 20:19:46 2017 -0700
@@ -13,6 +13,7 @@
   Skipping i18n/polib.py it has no-che?k-code (glob)
   Skipping mercurial/httpclient/__init__.py it has no-che?k-code (glob)
   Skipping mercurial/httpclient/_readers.py it has no-che?k-code (glob)
+  Skipping mercurial/selectors2.py it has no-che?k-code (glob)
   Skipping mercurial/statprof.py it has no-che?k-code (glob)
   Skipping tests/badserverext.py it has no-che?k-code (glob)