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

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

?(?-) (Empty replacements)

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

abc def pop-plain = abc test
abc def pop = abc 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

?(?-) (Lambdas)

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

?(?-) (Explode)

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

explode cow (c (o (w ()))) test

?(?-) (Implode)

<> (implode ?*) (?* =)

implode (b (a (t ()))) bat test