Import gevent.core.loop from gevent.__init__ on PyPy. Fixes #619.

changelog.rst

@@ -7,7 +7,16 @@
 Unreleased
 ==========
 
-- Nothing yet.
+- Fix an ``AttributeError`` from ``gevent.monkey.patch_builtins`` on
+  Python 2 when the `future`_ library is also installed. Reported by
+  Carlos Sanchez.
+- PyPy: Fix a ``DistutilsModuleError`` or ``ImportError`` if the CFFI
+  module backing ``gevent.core`` needs to be compiled when the hub is
+  initialized. Now, the module will be compiled when gevent is
+  imported. Reported in :issue:`619` by Thinh Nguyen with
+  contributions by Jay Oster and Matt Dupre.
+
+.. _future: http://python-future.org
 
 1.1b2 (Aug 5, 2015)
 ===================

gevent/__init__.py

@@ -70,3 +70,13 @@ def __dependencies_for_freezing():
     import signal
 
 del __dependencies_for_freezing
+
+if PYPY:
+    # We need to make sure that the CFFI compilation is complete if
+    # need be. Without this, we can get ImportError(ImportError:
+    # Cannot import 'core' from ...) from the hub or
+    # DistutilsModuleError (on OS X) depending on who first imports and inits
+    # the hub. See https://github.com/gevent/gevent/issues/619 (There
+    # is no automated test for this.)
+    from gevent.core import loop
+    del loop