p.s. The package supplies a `define-struct-updaters` macro separately.
This is handy because you can use it on any structs -- including those
from other modules you don't control. If you do this frequently for
your own structs, you could of course write a little macro to `(begin
(struct id ____) (define-struct-updaters id))`.

On Thu, Dec 7, 2017 at 2:19 PM, Greg Hendershott
<greghendersh...@gmail.com> wrote:
> 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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