On Thu, Dec 7, 2017 at 11:08 AM, David Storrs <david.sto...@gmail.com> wrote:
> assembled.  There's no reason not to use functional update, but I
> haven't seen a straightforward way to do that since there is no
> 'set-db-chunk-foo' as opposed to 'set-db-chunk-foo!'.   I guess I need
> to use 'struct-copy'?  At that point it seems more sensible to have a

There is a struct-update package:

  https://pkgd.racket-lang.org/pkgn/package/struct-update

Doc:

  http://docs.racket-lang.org/struct-update/index.html

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