Fills in the rest of function data into the skeleton function object

    The skeleton itself is create by _make_skel_func().

def _fill_function(*args):
    """Fills in the rest of function data into the skeleton function object

    The skeleton itself is create by _make_skel_func().
    """
    if len(args) == 2:
        func = args[0]
        state = args[1]
    elif len(args) == 5:
        # Backwards compat for cloudpickle v0.4.0, after which the `module`
        # argument was introduced
        func = args[0]
        keys = ['globals', 'defaults', 'dict', 'closure_values']
        state = dict(zip(keys, args[1:]))
    elif len(args) == 6:
        # Backwards compat for cloudpickle v0.4.1, after which the function
        # state was passed as a dict to the _fill_function it-self.
        func = args[0]
        keys = ['globals', 'defaults', 'dict', 'module', 'closure_values']
        state = dict(zip(keys, args[1:]))
    else:
        raise ValueError('Unexpected _fill_value arguments: %r' % (args,))

    # - At pickling time, any dynamic global variable used by func is
    #   serialized by value (in state['globals']).
    # - At unpickling time, func's __globals__ attribute is initialized by
    #   first retrieving an empty isolated namespace that will be shared
    #   with other functions pickled from the same original module
    #   by the same CloudPickler instance and then updated with the
    #   content of state['globals'] to populate the shared isolated
    #   namespace with all the global variables that are specifically
    #   referenced for this function.
    func.__globals__.update(state['globals'])

    func.__defaults__ = state['defaults']
    func.__dict__ = state['dict']
    if 'annotations' in state:
        func.__annotations__ = state['annotations']
    if 'doc' in state:
        func.__doc__  = state['doc']
    if 'name' in state:
        func.__name__ = state['name']
    if 'module' in state:
        func.__module__ = state['module']
    if 'qualname' in state:
        func.__qualname__ = state['qualname']

    cells = func.__closure__
    if cells is not None:
        for cell, value in zip(cells, state['closure_values']):
            if value is not _empty_cell_value:
                cell_set(cell, value)

    return func