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Demo of matche dispatch + conde + recursion for tree traversal:
(matche tree
((:leaf x) (== v x))
((:node l r) (conde ((btree-walko l v)) ((btree-walko r v)))))
Test tree ((1 2) (3 (4 5))) yields all 5 leaves under run*. Also tests
membership (run 1) and absence.
4 new tests, 441/441 cumulative.