This isn’t only an optimisation but also a change in behaviour, isn’t
it?
Clojure 1.9.0-alpha3:
user=> (let [[x & xs] #{1 2 3}] x)
UnsupportedOperationException nth not supported on this type:
PersistentHashSet clojure.lang.RT.nthFrom (RT.java:948)
Clojure 1.9.0-alpha4:
user=> (let [[x & xs] #{1 2 3}] x)
1
Perhaps the documentation needs to be updated?
http://clojure.org/reference/special_forms#_vector_binding_destructuring
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David
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