egglog 2.0.0

egglog is a language that combines the benefits of equality saturation and datalog. It can be used for analysis, optimization, and synthesis of programs. It is the successor to the popular rust library egg.
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(datatype Math
  (Num i64)
  (Var String)
  (Add Math Math)
  (Mul Math Math))

;; expr1 = 2 * (x + 3)
(let $expr1 (Mul (Num 2) (Add (Var "x") (Num 3))))
;; expr2 = 6 + 2 * x
(let $expr2 (Add (Num 6) (Mul (Num 2) (Var "x"))))


;; (rule ((= __root (Add a b)))
;;       ((union __root (Add b a)))
(rewrite (Add a b)
         (Add b a))
(rewrite (Mul a (Add b c))
         (Add (Mul a b) (Mul a c)))
(rewrite (Add (Num a) (Num b))
         (Num (+ a b)))
(rewrite (Mul (Num a) (Num b))
         (Num (* a b)))

(run 10)
(check (= $expr1 $expr2))