How does one attach a generic interface to a class?
`class*` allows one to attach an `interface` [2] (in the class sense of that
term, which I understand is separate from that of "generic interface").
Then the docs for `interface*` show an example attaching the
`prop:custom-write` property. [3] But the docs for `prop:custom-write` say that
it's deprecated, and one should "use `gen:custom-write`, instead" [4] (that is,
the generic-interface version this concept).
Yet I when I put `gen:custom-write` into `interface*`, it triggers an "illegal
use of syntax" error.
#lang racket
(define i<%> (interface* () ([gen:custom-write
(lambda (obj port mode) (void))])
method1 method2 method3))
So I'm not clear whether I'm doing it wrong, or if `interface*` only works with
the (deprecated) property-based technique.
[2]
http://docs.racket-lang.org/reference/createinterface.html?q=class*#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._interface%29%29
<http://docs.racket-lang.org/reference/createinterface.html?q=class*#(form._((lib._racket/private/class-internal..rkt)._interface))>
[3]
http://docs.racket-lang.org/reference/createinterface.html?q=class*#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._interface%2A%29%29
<http://docs.racket-lang.org/reference/createinterface.html?q=class*#(form._((lib._racket/private/class-internal..rkt)._interface*))>
[4]
http://docs.racket-lang.org/reference/Printer_Extension.html?q=class*#%28def._%28%28quote._~23~25kernel%29._prop~3acustom-write%29%29
<http://docs.racket-lang.org/reference/Printer_Extension.html?q=class*#(def._((quote._~23~25kernel)._prop~3acustom-write))>
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