- Int is bound to a non-integer.
- Int is a negative integer.
- List is neither a list nor a partial list. This error condition includes cyclic lists.122ISO demands failure here. We think an error is more appropriate.
This predicate fails if the tail of List is equivalent to
is logically correct. An exception would be more appropriate, but to our
best knowledge, current practice in Prolog does not describe a suitable
candidate exception term.