docs/deep/examples/ast/independent/after.py

_spine_future = _spine_prepare(lambda : ('lookup', {'key': 'book'}))
_spine_future_ = _spine_prepare(lambda : ('lookup', {'key': 'shipping'}))
a = _spine_resolve(_spine_future, 'lookup', key='book')
b = _spine_resolve(_spine_future_, 'lookup', key='shipping')
result = a + b