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

?(?-) (Early Test Primitives)

<> (?x = ?x ?n test) (?(?: ?:) (#pass ?n\n))

<> (ghost) ()

?(?-) (Formatter)

?((?x ?y) two) aaa(bbb) = two (formatter 1) test
?((?x ?y) two) (bbb)aaa = two (formatter 2) test
(a b c ) = (a b c) (formatter 3) test
( a b c) = (a b c) (formatter 4) test
(  a  b  c  ) = (a b c) (formatter 5) test
(a b c  ( a b c )  ) = (a b c (a b c)) (formatter 6) test

?(?-) (Empty replacements)

(ab cd () ghost) = (ab cd ()) (empty 1) test
(ab cd ghost ()) = (ab cd ()) (empty 2) test
(ab ghost cd ()) = (ab cd ()) (empty 3) test
(ghost ab cd ()) = (ab cd ()) (empty 4) test
(ghost) = () (empty 5) test

(q ?((?x ?y ?z) (?x ?y)) a b c) = (q a b) (empty 6) test
(q ?((?x ?y ?z) (?x ?z)) a b c) = (q a c) (empty 7) test
(q ?((?x ?y ?z) (?y ?z)) a b c) = (q b c) (empty 8) test

<> (prefix/pop ?x) ()
<> (?x suffix/pop) ()

(ab prefix/pop cd ef) = (ab ef) (empty 9) test
(ab cd suffix/pop ef) = (ab ef) (empty 10) test

?(?-) (Basic register setups)

<> (dup (?x)) (?x ?x)
<> (swap (?x ?y)) (?y ?x)
<> (compare (?x ?x ?x)) (#t)
<> (rotate (?x (?y (?z)))) (?y (?z (?x)))
<> (unused ?x) ?y

(dup (abc)) = (abc abc) (basic 1) test
(swap (abc def)) = (def abc) (basic 2) test
(compare (abc abc abc)) = (#t) (basic 3) test
(rotate (abc (def (ghi)))) = (def (ghi (abc))) (basic 4) test
(unused hey) = (?y) (basic 5) test

?(?-) (Substring registers)

<> (connect ?x ?y ?z) (?x-?y?z)
<> (prefix-?x) (?x-suffix)

connect foo bar baz = foo-barbaz (substring 1) test
prefix-anything = anything-suffix (substring 2) test
?(foo QQQ) foobar = foobar (substring 3) test

?(?-) (Lambdas)

(?(?x (?x ?x)) abc) = (abc abc) (lambda 1) test
abc ?(?x) def = abc (lambda 2) test

?(?-) (op: explode)

(?(?* ?*) cow) = (c (o (w ()))) (explode word) test
(?(?* ?*) (12 34 45)) = (12 (34 (45 ()))) (explode tuple) test
(?(?* ?*) ()) = () (explode empty) test

?(?-) (op: join)

?(?^ ?^) (b (a (t ()))) = bat (join 1) test
?(?^ ?^) (12 (34 (56 ()))) = 123456 (join 2) test
(?(?^ ?^) ()) = () (join empty) test

?(?-) (op: unwrap)

?(?. ?.) (abcd) = abcd (unwrap 1) test
(?(?. ?.) ()) = () (unwrap empty) test

?(?-) (List reversal)

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

reverse (modal) = ladom (reverse 1) test

?(?-) (Inline rules)

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

nap tap (inline 1) test

?(?-) (Undefinition)

<> (undefine-me) (abc)
<> (undefine-me) (def)
<> (undefine-me) (ghi)
>< (undefine-me)

(undefine-me) = (def) (undefinition 1) test

>< (undefine-me)

(undefine-me) = (ghi) (undefinition 2) test

?(?-) (Late Test Primitives)

<> (?x = ?y ?n test) (?(?: ?:) (#fail ?n found: ?x expect: ?y\n))