PyPy can build and use the cython ares extension, at least on my system, so...

PyPy can build and use the cython ares extension, at least on my system, so turn it on for travis testing.

.travis.yml

@@ -17,10 +17,10 @@ install:
     # disables the cache.
     - travis_retry pip install -U tox cython greenlet pep8 pyflakes
 script:
-    - if [[ $TRAVIS_PYTHON_VERSION == '2.7' && $LINT == true ]]; then python setup.py develop && make travis_test_linters; elif [[ $LINT == false && $TRAVIS_PYTHON_VERSION == 'pypy' ]]; then python setup.py develop && make toxtest; elif [[ $LINT == false ]]; then python setup.py develop && make fulltoxtest; fi
+    - if [[ $TRAVIS_PYTHON_VERSION == '2.7' && $LINT == true ]]; then python setup.py develop && make travis_test_linters; elif [[ $LINT == false && $TRAVIS_PYTHON_VERSION == 'pypy' ]]; then python setup.py develop && make fulltoxtest; elif [[ $LINT == false ]]; then python setup.py develop && make fulltoxtest; fi
 notifications:
   email: false
-# cache: pip seems not to work
+# cache: pip seems not to work if `install` is replaced (https://github.com/travis-ci/travis-ci/issues/3239)
 cache:
   directories:
     - $HOME/.cache/pip

gevent/resolver_ares.py

@@ -6,7 +6,7 @@ from __future__ import absolute_import
 import os
 import sys
 from _socket import getservbyname, getaddrinfo, gaierror, error
-from gevent.hub import Waiter, get_hub, string_types, text_type, reraise, PY3
+from gevent.hub import Waiter, get_hub, string_types, text_type, integer_types, reraise, PY3
 from gevent.socket import AF_UNSPEC, AF_INET, AF_INET6, SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, AI_NUMERICHOST, EAI_SERVICE, AI_PASSIVE
 from gevent.ares import channel, InvalidIP
 
@@ -25,8 +25,10 @@ class Resolver(object):
     In comparison to :class:`gevent.resolver_thread.Resolver`, the
     implementation is much more complex. In addition, there have been
     reports of it not properly honoring certain system configurations.
-    Finally, it is not available on PyPy. However, because it does not
-    use threads, it may scale better.
+    However, because it does not use threads, it may scale better.
+
+    .. note:: This module is considered experimental on PyPy, and
+       due to its implementation in cython, it may be slower.
 
     .. _c-ares: http://c-ares.haxx.se
     """
@@ -133,10 +135,10 @@ class Resolver(object):
                     raise error('Int or String expected')
         elif port is None:
             port = 0
-        elif isinstance(port, int):
+        elif isinstance(port, integer_types):
             pass
         else:
-            raise error('Int or String expected')
+            raise error('Int or String expected', port, type(port))
         port = int(port % 65536)
         if not socktypes and socktype:
             socktypes.append(socktype)

setup.py

@@ -332,6 +332,7 @@ elif PYPY:
     system('cd gevent/libev && ./configure > configure_output.txt')
     from gevent import corecffi
     ext_modules = [corecffi.ffi.verifier.get_extension(),
+                   ARES,
                    # By building the semaphore with Cython under PyPy, we get
                    # atomic operations (specifically, exiting/releasing), at the
                    # cost of some speed (one trivial semaphore micro-benchmark put the pure-python version
@@ -404,5 +405,5 @@ if __name__ == '__main__':
             raise
         ext_modules.remove(ARES)
         run_setup(ext_modules, run_make=run_make)
-    if not PYPY and ARES not in ext_modules:
+    if ARES not in ext_modules:
         sys.stderr.write('\nWARNING: The gevent.ares extension has been disabled.\n')