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Ground-cases propagator: when at least two of {x, y, z} walk to
ground numbers, the third is derived (or checked, if also ground).
Three vars with domains: deferred — no bounds-consistency in this
iteration.
Includes a small fd-bind-or-narrow helper that handles the common
"bind a var to a target int, respecting any existing domain"
pattern shared across propagators.
7 new tests: ground/ground/ground, recover x, recover y, impossible
case, domain-check rejection, x+y=5 enumeration, large numbers.
617/617 cumulative.
63 lines
1023 B
Plaintext
63 lines
1023 B
Plaintext
;; lib/minikanren/tests/clpfd-plus.sx — fd-plus (x + y = z).
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(mk-test
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"fd-plus-all-ground"
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(run* q (fresh (z) (fd-plus 2 3 z) (== q z)))
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(list 5))
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(mk-test
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"fd-plus-recover-x"
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(run* q (fresh (x) (fd-plus x 3 5) (== q x)))
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(list 2))
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(mk-test
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"fd-plus-recover-y"
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(run* q (fresh (y) (fd-plus 2 y 5) (== q y)))
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(list 3))
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(mk-test
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"fd-plus-impossible-fails"
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(run*
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q
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(fresh
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(z)
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(fd-plus 2 3 z)
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(== z 99)
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(== q z)))
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(list))
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(mk-test
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"fd-plus-domain-check"
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(run*
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q
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(fresh
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(x)
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(fd-in x (list 3 4 5))
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(fd-plus x 3 5)
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(== q x)))
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(list))
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(mk-test
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"fd-plus-pairs-summing-to-5"
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(run*
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q
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(fresh
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(x y)
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(fd-in x (list 1 2 3 4))
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(fd-in y (list 1 2 3 4))
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(fd-plus x y 5)
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(fd-label (list x y))
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(== q (list x y))))
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(list
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(list 1 4)
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(list 2 3)
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(list 3 2)
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(list 4 1)))
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(mk-test
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"fd-plus-z-derived"
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(run* q (fresh (z) (fd-plus 7 8 z) (== q z)))
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(list 15))
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(mk-tests-run!)
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