can't unpickle `curry`ied function coming from `__main__`

[dlovell]

if i run

import toolz
from cloudpickle import dumps


@toolz.curry
def f(x, *args, **kwargs):
    return x, args, kwargs

g = f(y=1)
with open("dumped.pkl", "wb") as fh:
    fh.write(dumps(g))

in one python session and then run

from cloudpickle import loads

with open("dumped.pkl", "rb") as fh:
    g = loads(fh.read())

in another python session, i see AttributeError: module '__main__' has no attribute 'f'