An interpreter for implementing interactive consoles.
Domain of extension functions.
Ref is a native object stored in an Obj.
Incrementally constructed state.
Fun is an extension function object.
FunMut is an extension function object with side-effects.
Parse and evaluate a statement. A derived state with the result value is returned.
Stringify (), bool, i64, String, Ref or Pair. String will be quoted. None is returned if the type is not supported.