#23 Customisable printer for SRFI-9 records

[Tony Garnock-Jones]

Currently records are printed in a very ugly way. I
don't really care about that as such, but I'd like to
be able to customise record printing, at least for my
own SRFI-9 record types. Ideally, I'd be able to
customise the default record printer, as well, but
that's a less important issue.

Chicken provides:

(define-syntax define-record-printer
(syntax-rules ()
((_ (record-type-name instance port) body ...)
(<some means of installing the following lambda in
a table against record-type-name>
(lambda (instance port)
body ...)))))

Where "instance" and "port" are bound appropriately
during the execution of "body ...".

[Tony Garnock-Jones]

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Exact compatibility with chicken would be useful. Once
implemented, this can be SRFI-ised straightforwardly.