You could define your own cons type, like Bodil Stokke did for her
microkanren
https://github.com/bodil/microkanrens/blob/77dbdc34cde580e26765138102cbdabbfad85b9d/mk.clj#L13
If you mark its fields with ^:volatile-mutable, you can call (set! (.-a
lst) new-car) on a cons instance.

cheers

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