syntax
( define-signature-form sig-form-idexpr)
In the first form, the result of expr must be a transformer procedure that accepts one argument. In the second form, sig-form-id is bound to a transformer procedure whose argument is id and whose body is the bodys. The third form is like the second one, but intro-id is bound to a procedure that is analogous to syntax-local-introduce for the signature-form expansion.
The result of the transformer procedure 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.)
Changed in version 8.1.0.7 of package base: Added support for the form with a transformer expr.
syntax
( struct/ctc id([fieldcontract-expr]...)struct-option...)
field = id| [id#:mutable]struct-option = #:mutable| #:omit-constructor| #:omit-define-syntaxes| #:omit-define-values