I'm trying to use the record #:parent property to refactor some code. I'm unable to use the parent property of a record, what is the proper usage of this property?
(define-record-type <particle> (make-particle) particle? ;; omitted) (define-record-type <prop> #:parent <particle> (make-prop) prop? ;; omitted)
The define-record-type procedure is from SRFI-9. The #:parent propery applies to make-record-type which is a lower-level Guile specific. The define-record-type does not accept a #:parent keyword.
There is also a define-record-type in R6RS which has a (parent ...). See https://www.gnu.org/software/guile/manual/html_node/R6RS-Records.html
If this is confusing, it's because after R6RS was published, Scheme splintered and grew in different directions; Guile lisp supports all these directions at the same time. You can read http://dpk.io/r7rswtf if you are interested in the history.
The parent property appears under make-record-type, not define-record-type.
https://www.gnu.org/software/guile/manual/html_node/Records.html
Records that can be subtyped must be marked as #:extensible. See this unit test of records for an example: https://gitlab.com/spritely/guile-hoot/-/blob/main/test/test-records.scm?ref_typ...
I haven't actually used this feature for myself, yet. I hope it works okay!
