issues: 389865283

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389865283 MDU6SXNzdWUzODk4NjUyODM= 2600 Tests are failing on dask-dev 2448579 closed 0     1 2018-12-11T17:09:57Z 2018-12-12T03:13:30Z 2018-12-12T03:13:30Z MEMBER      

Sample error from https://travis-ci.org/pydata/xarray/jobs/466431752

``` _____ test_dataarray_with_dask_coords ______ def test_dataarray_with_dask_coords(): import toolz x = xr.Variable('x', da.arange(8, chunks=(4,))) y = xr.Variable('y', da.arange(8, chunks=(4,)) * 2) data = da.random.random((8, 8), chunks=(4, 4)) + 1 array = xr.DataArray(data, dims=['x', 'y']) array.coords['xx'] = x array.coords['yy'] = y

    assert dict(array.__dask_graph__()) == toolz.merge(data.__dask_graph__(),
                                                       x.__dask_graph__(),
                                                       y.__dask_graph__())

  (array2,) = dask.compute(array)

xarray/tests/test_dask.py:824:

../../../miniconda/envs/test_env/lib/python3.6/site-packages/dask/base.py:395: in compute dsk = collections_to_dsk(collections, optimize_graph, *kwargs) ../../../miniconda/envs/test_env/lib/python3.6/site-packages/dask/base.py:187: in collections_to_dsk for opt, val in groups.items()} ../../../miniconda/envs/test_env/lib/python3.6/site-packages/dask/base.py:187: in <dictcomp> for opt, val in groups.items()} ../../../miniconda/envs/test_env/lib/python3.6/site-packages/dask/base.py:212: in _extract_graph_and_keys graph = merge(graphs)

dicts = <dask.sharedict.ShareDict object at 0x7f307d29a128>, kwargs = {} factory = <class 'dict'>, rv = {} d = ('arange-36f53ab1e6153a63bbf7f4f8ff56693c', 0) def merge(dicts, *kwargs): """ Merge a collection of dictionaries

    >>> merge({1: 'one'}, {2: 'two'})
    {1: 'one', 2: 'two'}

    Later dictionaries have precedence

    >>> merge({1: 2, 3: 4}, {3: 3, 4: 4})
    {1: 2, 3: 3, 4: 4}

    See Also:
        merge_with
    """
    if len(dicts) == 1 and not isinstance(dicts[0], dict):
        dicts = dicts[0]
    factory = _get_factory(merge, kwargs)

    rv = factory()
    for d in dicts:

      rv.update(d)

E ValueError: dictionary update sequence element #0 has length 39; 2 is required ../../../miniconda/envs/test_env/lib/python3.6/site-packages/toolz/dicttoolz.py:39: ValueError ```

 
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