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Verifies that the Zzz-wraps-each-conde-clause + mk-mplus-suspend-on- paused-left machinery produces fair interleaving and gives finite prefixes from infinitely-recursive relations: - listo-aux has no base case under run* but run 4 q ... produces exactly the four shortest list shapes, in order. - mk-disj of two infinite generators (ones-gen, twos-gen) with run 4 q ... must include both 1-prefixed and 2-prefixed answers (no starvation). - run* terminates on a goal that has a finite answer set. 3 tests, 246/246 cumulative.
78 lines
1.7 KiB
Plaintext
78 lines
1.7 KiB
Plaintext
;; lib/minikanren/tests/laziness.sx — verify Zzz wrapping (in conde)
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;; lets infinitely-recursive relations produce finite prefixes via run-n.
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;; --- a relation that has no base case but conde-protects via Zzz ---
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(define
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listo-aux
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(fn
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(l)
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(conde ((nullo l)) ((fresh (a d) (conso a d l) (listo-aux d))))))
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(mk-test
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"infinite-relation-truncates-via-run-n"
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(run 4 q (listo-aux q))
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(list
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(list)
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(list (make-symbol "_.0"))
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(list (make-symbol "_.0") (make-symbol "_.1"))
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(list (make-symbol "_.0") (make-symbol "_.1") (make-symbol "_.2"))))
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;; --- two infinite generators interleaved via mk-disj must both produce
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;; answers (no starvation) — the fairness test ---
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(define
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ones-gen
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(fn
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(l)
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(conde
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((== l (list)))
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((fresh (d) (conso 1 d l) (ones-gen d))))))
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(define
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twos-gen
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(fn
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(l)
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(conde
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((== l (list)))
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((fresh (d) (conso 2 d l) (twos-gen d))))))
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(mk-test
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"interleaving-keeps-both-streams-alive"
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(let
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((res (run 4 q (mk-disj (ones-gen q) (twos-gen q)))))
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(and
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(= (len res) 4)
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(and
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(some
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(fn
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(x)
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(and
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(list? x)
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(and (not (empty? x)) (= (first x) 1))))
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res)
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(some
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(fn
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(x)
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(and
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(list? x)
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(and (not (empty? x)) (= (first x) 2))))
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res))))
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true)
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;; --- run* terminates on a relation whose conde has finite base case
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;; reached from any starting point ---
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(mk-test
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"run-star-terminates-on-bounded-relation"
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(run*
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q
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(fresh
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(l)
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(== l (list 1 2 3))
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(listo l)
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(== q :ok)))
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(list :ok))
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(mk-tests-run!)
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