Unless it's meant to be a secret :), I thought I'd show the printer
func argument of make-record-type in the manual,
-- Scheme Procedure: make-record-type type-name field-names [printer]
Create and return a new "record-type descriptor".
TYPE-NAME is a string naming the type. Currently it's only used
in the printed representation of records, and in diagnostics.
FIELD-NAMES is a list of symbols naming the fields of a record of
the new type. Duplicates are not allowed among these symbols.
(make-record-type "employee" '(name age salary))
The optional PRINTER argument is a function for printing a record
of the new type. It's called as `(PRINTER record port)' and
should look at RECORD and write to PORT.
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