|(define-signature-form sig-form-id expr)|
|(define-signature-form (sig-form-id id) body )|
Binds sig-form-id for use within a define-signature form.
In the first form, the result of expr must be a transformer procedure. In the second form, sig-form-id is bound to a transformer procedure whose argument is id and whose body is the bodys. The result of the transformer must be a list of syntax objects, which are substituted for a use of sig-form-id in a define-signature expansion. (The result is a list so that the transformer can produce multiple declarations; define-signature has no splicing begin form.)}
|(struct id (field ) option )|
For use with define-signature. The expansion of a struct signature form includes all of the identifiers that would be bound by (define-struct id (field ) option ), where the extra option #:omit-constructor omits the make-id identifier.