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clojure.core

Available in 1.6 (source)
    Assignment special form. When the first operand is a field member access
    form, the assignment is to the corresponding field. If it is an instance
    field, the instance expr will be evaluated, then the expr. In all cases
    the value of expr is returned. Note - you cannot assign to function params
    or local bindings. Only Java fields, Vars, Refs and Agents are mutable in
    Clojure. See http://clojure.org/special_forms for more information.