[racket] struct-copy with sub-types

On Fri, Mar 25, 2011 at 16:32, Robby Findler
<robby at eecs.northwestern.edu> wrote:
>> Isn't the second case the case Robby said it still doesn't work?
>
> Oh, sorry, yes: you'd have to write this:
>
>  (struct-copy sub (sub 1 2 3) [b #:parent base 4])
>
> or else it would be a syntax error.

OK. The examples clarified this.