[racket] Are there any functional structs in Racket

I have a prototype that supports syntax like this one: 

 (dot a-world ufo wings left)

which would select the left field of a wings field in a ufo field of a world struct. 

Similarly, 

 (set a-world ufo wings left 'broken)

would be a functional update. 

I intend to add it into the 2htdp languages. 





On Oct 20, 2010, at 2:21 PM, Tony Garnock-Jones wrote:

> Stephen Bloch wrote:
>> person-age-set
>> set-person-age (without the !)
>> person-with-age
> 
> I like this last one, especially if it were possible to use the old abbreviation of "/" for "-with-":
> 
> (person/age p 25)
> 
> Tony
> 
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