?(?-) (This example tests various aspects of the implementation.)

?(?-) (Inline rules)

<> ((?x -> ?y)) (<> ?x ?y)
(nap -> (tap =))

nap tap test

?(?-) (Empty replacements)

<> (?x pop-plain)
<> (?x pop) ()
<> (ghost) ()

abc def pop-plain = abc test
abc def pop = abc test
(ghost) = () test

?(?-) (Basic replacements)

<> (replace-name (foo)) ((bar) =)

replace-name (foo) (bar) test

?(?-) (Basic register setups)

<> (dup (?x)) ((?x ?x) =)
<> (swap (?x ?y)) ((?y ?x) =)
<> (compare (?x ?x ?x)) ((#t) =)

dup (abc) (abc abc) test
swap (abc def) (def abc) test
compare (abc abc abc) (#t) test

?(?-) (Empty register replacement)

<> (replace-empty ?x) (?y)

replace-empty abc = ?y test

?(?-) (Guards setups)

<> (join (String ?x) (String ?y)) ((?x ?y) =)

join (String abc) (String def) (abc def) test

?(?-) (Lambdas)

?((?x) ((?x ?x) =)) abc (abc abc) test
abc ?(?x) def = abc test

?(?-) (Explode)

<> (explode ?*) ((?*) =)

explode cow (c (o (w ()))) test
explode (12 34 45) (12 (34 (45 ()))) test

?(?-) (Implode)

<> (implode ?^) (?^ =)

implode (b (a (t ()))) bat test
implode (12 (34 (56 ()))) 123456 test

?(?-) (Test Primitives)

<> (?: print) (?:)
<> (?x = ?x test) (#ok)
<> (?x = ?y test) (#fail)

?(?-) (List reversal)

<> (reverse List () ?^) (?^)
<> (reverse (?*)) (reverse List (?*) ())
<> (reverse List (?x ?y) ?z) (reverse List ?y (?x ?z))

reverse (modal) = ladom test