 
 # The IntSet class.
 class IntSet extends Collection
-  this::class = this
   @name = "IntSet"
 
   # Returns the elements as a stream


# The IntMap class is essentially a huge sparse array.
class IntMap extends Collection
  this::class = this
  @name = "IntMap"

  # Returns the (key,value)-pairs as a stream

# The HashSet class provides the public API and serves as a wrapper
# for the various node classes that hold the actual information.
class HashSet extends Collection
  @name = "HashSet"

  # Returns the elements as a stream
