Я не хочу, чтобы удалить [:b :B]
из [[:a :A] [:b :B] [:c :C]]
в следующем примере кода, и если я заменю :B
с (lvar)
, он больше не работает:Как удалить [: b (lvar)] из [[: a: A] [: b: B] [: c: C]] в Clojure core.logic?
;; Helper Function
(defne not-membero [x l]
([_ []])
([_ [?y . ?r]]
(!= x ?y)
(not-membero x ?r)))
Эти работы:
(run* [q]
(membero q [[:a :A] [:b :B] [:c :C]])
(not-membero q [[:b :B]]))
(run* [q]
(membero q [[:a :A] [:b :B] [:c :C]])
(!= q [:b :B]))
;; both return [[:a :A] [:c :C]], as expected
Это не (уведомление lvar
):
(run* [q]
(membero q [[:a :A] [:b :B] [:c :C]])
(not-membero q [[:b (lvar)]]))
(run* [q]
(membero q [[:a :A] [:b :B] [:c :C]])
(!= q [:b (lvar)]))
;; both return [[:a :A] [:b :B] [:c :C]], unexpected