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Pack xlibrary -- prolog/neck.pl
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 neck is det
 necki is det
 necks is det
 neckis is det
 neck(L, L) is det
 necki(L, L) is det
 necks(L, L) is det
 neckis(L, L) is det
Establish that everything above it should be evaluated at compile time, be careful since such part can only contain predicates already defined. In case of non-determinism, several clauses would be generated. This is a practical way to generate automatic clauses with a proper instantiation of the head. If neck can not be expanded, it will succeed without side effects.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 neck(Arg1, Arg2)
 necki(Arg1, Arg2)
 necks(Arg1, Arg2)
 neckis(Arg1, Arg2)