Set Expressions
6.3.90.900

Set Expressions

 #lang set-exp package: set-exp

This module adds literal set syntax as a meta-language.

> #lang set-exp racket
> (define some-set {1 2 3 4})
> (set-member? some-set 3)
#t
> (set-member? some-set 'foo)
#f

source code: https://github.com/jackfirth/set-exp