id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
180756013,MDU6SXNzdWUxODA3NTYwMTM=,1034,test_conventions.TestEncodeCFVariable failing on master for Appveyor Python 2.7 build,1217238,closed,0,,,5,2016-10-03T21:48:55Z,2016-10-22T00:49:53Z,2016-10-22T00:49:53Z,MEMBER,,,,"I have on idea what's going on here but maybe somebody who knows Windows better has a guess:

```
================================== FAILURES ===================================
_________________ TestEncodeCFVariable.test_missing_fillvalue _________________
self = <xarray.test.test_conventions.TestEncodeCFVariable testMethod=test_missing_fillvalue>
    def test_missing_fillvalue(self):
        v = Variable(['x'], np.array([np.nan, 1, 2, 3]))
        v.encoding = {'dtype': 'int16'}
        with self.assertWarns('floating point data as an integer'):
>           conventions.encode_cf_variable(v)
xarray\test\test_conventions.py:523: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C:\Python27-conda32\lib\contextlib.py:24: in __exit__
    self.gen.next()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <xarray.test.test_conventions.TestEncodeCFVariable testMethod=test_missing_fillvalue>
message = 'floating point data as an integer'
    @contextmanager
    def assertWarns(self, message):
        with warnings.catch_warnings(record=True) as w:
            warnings.filterwarnings('always', message)
            yield
            assert len(w) > 0
>           assert all(message in str(wi.message) for wi in w)
E           AssertionError: NameError: all(<generator object <genexpr> at 0x0617D170>)  << global name 'message' is not defined
xarray\test\__init__.py:140: AssertionError
============== 1 failed, 970 passed, 67 skipped in 70.58 seconds ==============
```

I could understand a warning failing to be raised, but the `NameError` is especially strange.
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