(defmacro to-hash
  "Convert expression into hasmap.
  Example:
  => (to-hash (+ 1 2))
  {(+ 1 2) 3}"
  [arg] `{'~arg ~arg})

(defmacro log
  "Log expression to console and execute it.
  Example:
  => (log (+ 1 2))
  [#inst \"2019-01-23T09:02:52.479-00:00\" {:line 1, :column 1} ((+ 1 2))]
  3"
  [& body]
  `(do
      (println [(java.util.Date.) ~(meta &form) '~body])
      (do ~@body)))