- All Known Implementing Classes:
- EmptyList, EOFObject, MemoizedSymbol, Nothing, Quantity, SchemeBoolean, SchemeVoid, Syntax
public interface Singleton
A Singleton is a Value or Expression that is always pointer equal to
itself. That is, there is only one of its kind in existance
anywhere in the Scheme System at any time. Scheme #t, #f, #!eof,
and the empty list are all examples of singletons.