=================================== FAILURES ===================================
____________________________ test_interpolate_dask _____________________________

    @requires_dask
    def test_interpolate_dask():
        da, _ = make_interpolate_example_data((40, 40), 0.5)
        da = da.chunk({"x": 5})
>       actual = da.interpolate_na("time")

xarray/tests/test_missing.py:312: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
xarray/core/dataarray.py:2018: in interpolate_na
    **kwargs
xarray/core/missing.py:250: in interp_na
    keep_attrs=True,
xarray/core/computation.py:1057: in apply_ufunc
    keep_attrs=keep_attrs
xarray/core/computation.py:239: in apply_dataarray_vfunc
    result_var = func(*data_vars)
xarray/core/computation.py:609: in apply_variable_ufunc
    result_data = func(*input_data)
xarray/core/computation.py:599: in func
    output_sizes,
xarray/core/computation.py:729: in _apply_blockwise
    new_axes=output_sizes
/usr/share/miniconda/envs/xarray-tests/lib/python3.7/site-packages/dask/array/blockwise.py:195: in blockwise
    token or utils.funcname(func).strip("_"),
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

func = <numpy.vectorize object at 0x7efdc0762c50>

    def funcname(func):
        """Get the name of a function."""
        # functools.partial
        if isinstance(func, functools.partial):
            return funcname(func.func)
        # methodcaller
        if isinstance(func, methodcaller):
            return func.method
    
        module_name = getattr(func, "__module__", None) or ""
        type_name = getattr(type(func), "__name__", None) or ""
    
        # toolz.curry
        if "toolz" in module_name and "curry" == type_name:
            return func.func_name
        # multipledispatch objects
        if "multipledispatch" in module_name and "Dispatcher" == type_name:
            return func.name
        # numpy.vectorize objects
        if "numpy" in module_name and "vectorize" == type_name:
>           return "vectorize_" + func.pyfunc.__name__
E           AttributeError: 'functools.partial' object has no attribute '__name__'