[racket] Functional struct update with subtypes

On Wed, May 11, 2011 at 3:45 PM, David Van Horn <dvanhorn at ccs.neu.edu> wrote:
> Is there a good way to do a functional struct updates with subtypes of a
> structure?

There was some discussion about it a while ago in reference to
struct-copy. The documentation has been updated with some useful
examples, including usage of the new #parent parameter:
http://docs.racket-lang.org/reference/struct-copy.html