(defmacro as->
"Binds name to expr, evaluates the first form in the lexical context
of that binding, then binds name to that result, repeating for each
successive form, returning the result of the last form."
{:added "1.5"}
[expr name & forms]
`(let [~name ~expr
~@(interleave (repeat name) (butlast forms))]
~(if (empty? forms)
name
(last forms))))