Dear all,

I have a problem where a lot of concurrency could be gained by having
a tree of references.
ie a tree where each nodes contain a ref to a set of similar tree.

(I know that having mutable trees is asking for troubles, but that is
quite necessary for the things I wish to do.)

I read that
"The values placed in Refs must be, or be considered, immutable!!
Otherwise, Clojure can't help you."

I put a lot of hope (and cross fingers) in the "be considered" part of
the sentence :).

Under which conditions can you use a ref inside a ref?
What happens if you don't? For cultural purpose: what is the canonical
example of a problem?

Best regards,

Nicolas.

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