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In a use of the syntax define-record-type, the definition
clause:
(custom-printer ?expr)
allows the specification of an expression ?expr which must evaluate to a custom printer function for instances of the record–type; iklib records printer, for details on record’s custom printers.
Usage example:
(define-record-type duo
(fields one two)
(custom-printer
(lambda (record port sub-printer)
(display "#{record duo one=" port)
(display (duo-one record) port)
(display " two=" port)
(display (duo-two record) port)
(display "}" port))))
(display (make-duo 1 2))
-| #{record duo one=1 two=2}