The original example had an explicit deserializer:

At Sun, 23 Jul 2017 19:54:43 -0500, Philip McGrath wrote:
>   (define deserialize-info:adder-v0
>     (make-deserialize-info make-adder
>                            (λ () (error 'adder
>                                         "can't have cycles"))))

You're constructing the deserializer with `make-adder` --- the variant
from inside the `server` module, so it doesn't have a contract.

I think this is where you want to draw a new boundary by giving
`make-deserialize-info` a variant of `make-adder` that has a contract.

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