Yes, transients mutate when updated. Seqs over sets are a immutable view
over a collection. So if someone did get this to work, the implementation
could be incorrect. And you could get something really strange like this:
(def s (transient #{1 2}))
(def sq (seq s))
(first sq) => 1
(disj s 1)
(second sq) => nil
There's a dozen things that could go really wrong here, but that's the gist
of it.
On Sat, Feb 24, 2018 at 8:14 AM, 'Alan Forrester' via Clojure <
[email protected]> wrote:
> Calling (first #{1}) gives the result 1.
>
> Calling (first (transient #{1})) gives an error:
>
> “IllegalArgumentException Don't know how to create ISeq from: clojure.lang.
> PersistentHashSet$TransientHashSet clojure.lang.RT.seqFrom (RT.java:550)”
>
> Is this behaviour intended?
>
> And whether or not this is intentional is there a way round it?
>
> Alan Forrester
>
>
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