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what do :copiers do?
Assuming that the functionality of being able to copy a structure and
get back a structure of the same type and the functionality of being
able to copy a particular "sub-type part" of a structure are worthwhile,
here is a scheme which seems nice:
(defstruct person name)
(defstruct (astronaut (:include person)) helmet-size)
In the scheme I am proposing:
- copy-person of an astronaut returns a person
- a "new" function, copy, which given an astronaut returns an astronaut
COPY-xxx as defined by a defstruct returns a structure of that
COPY returns a structure of the same type as its argument.