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rose-ash/lib/minikanren/tests/flatteno.sx
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mk: flatteno — nested list flattener
Three conde clauses: nullo tree -> nullo flat; pairo tree -> recurse on
car & cdr, appendo their flattenings; otherwise tree must be a ground
non-list atom (nafc nullo + nafc pairo) and flat = (list tree).

Works on ground inputs of arbitrary nesting:
  (run* q (flatteno (list 1 (list 2 3) (list (list 4) 5)) q))
    -> ((1 2 3 4 5))

7 tests, 253/253 cumulative. Phase 4 list relations now complete.
2026-05-08 10:46:13 +00:00

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(mk-test "flatteno-empty" (run* q (flatteno (list) q)) (list (list)))
(mk-test
"flatteno-atom"
(run* q (flatteno 5 q))
(list (list 5)))
(mk-test
"flatteno-flat-list"
(run* q (flatteno (list 1 2 3) q))
(list (list 1 2 3)))
(mk-test
"flatteno-singleton"
(run* q (flatteno (list 1) q))
(list (list 1)))
(mk-test
"flatteno-nested-once"
(run*
q
(flatteno (list 1 (list 2 3) 4) q))
(list (list 1 2 3 4)))
(mk-test
"flatteno-nested-twice"
(run*
q
(flatteno
(list
1
(list 2 (list 3 4))
5)
q))
(list (list 1 2 3 4 5)))
(mk-test
"flatteno-keywords"
(run* q (flatteno (list :a (list :b :c) :d) q))
(list (list :a :b :c :d)))
(mk-tests-run!)