Not arguing that the following method can be trusted as much as in Haskell but properly used also prevents this kind of scenario: https://clojuredocs.org/cloju

Not arguing that the following method can be trusted as much as in Haskell but properly used also prevents this kind of scenario: https://clojuredocs.org/clojure.core/io℅21 https://clojuredocs.org/clojure.core/io℅21 The 'io!' macro marks a code block to have side effects which prevents using it in a STM transaction as 'dosync' might need to execute the functions multiple times in case of conflicts during the optimistic locking.