when compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.

scope_id: (host, port).

test_sock_connect_address()

The "exc" variable was not defined, pass a BrokenPipeError exception instead.

Use self._loop instead of self._transport._loop, because transport._loop is set
to None at process exit.

env var), document the default debug mode

Add also a PYTHONASYNCIODEBUG environment variable to debug coroutines since
Python startup, to be able to debug coroutines defined directly in the asyncio
module.

Initial patch by Nick Coghlan.

On Mac OS X Tiger (and older), getsockname() returns a zero-length address for
UNIX socket, and so 'sockname' extra info is None.

of BaseEventLoop

Thanks to Vajrasky Kok for discovering some of them.

sockname, as _basetest_create_ssl_connection().

DeprecationWarning warnings. create_unix_server() closes the socket on any
error, not only on OSError.

Mention if the error was caused by a read or a write, and be more specific on
the object (ex: "pipe transport" instead of "transport").

OpenBSD older than 5.5