I describe the behavior of my sole instance, nil. nil represents a prior value for variables that have not been initialized, or for results which are meaningless.

	class hierarchy
	addSubclass: environment removeSubclass: subclass:instanceVariableNames:classVariableNames:poolDictionaries:category: subclassDefinerClass subclasses subclassesDo: subclassesDoGently: typeOfClass

	copying
	clone deepCopy shallowCopy veryDeepCopyWith:

	dependents access
	addDependent: release suspend

	printing
	newTileMorphRepresentative printOn: storeOn:

	testing
	haltIfNil ifNil: ifNil:ifNotNil: ifNotNil: ifNotNil:ifNil: ifNotNilDo: isEmptyOrNil isLiteral isNil notNil

	3ds parser support	top
	from3DS:

	class hierarchy	top
	addSubclass: Ignored -- necessary to support disjoint class hierarchies
	environment Necessary to support disjoint class hierarchies.
	removeSubclass: Ignored -- necessary to support disjoint class hierarchies
	subclass:instanceVariableNames:classVariableNames:poolDictionaries:category: Calling this method is now considered an accident. If you really want to create a class with a nil superclass, then create the class and then set the superclass using #superclass:
	subclassDefinerClass For disjunct class hierarchies -- how should subclasses of nil be evaluated
	subclasses Return all the subclasses of nil
	subclassesDo: Evaluate aBlock with all subclasses of nil.
	subclassesDoGently: Evaluate aBlock with all subclasses of nil. Others are not direct subclasses of Class.
	typeOfClass Necessary to support disjoint class hierarchies.

	copying	top
	clone Only one instance of UndefinedObject should ever be made, so answer with self.
	deepCopy Only one instance of UndefinedObject should ever be made, so answer with self.
	shallowCopy Only one instance of UndefinedObject should ever be made, so answer with self.
	veryDeepCopyWith: Return self. I can't be copied. Do not record me.

	dependents access	top
	addDependent: Refer to the comment in Object|dependents.
	release Nil release is a no-op
	suspend Kills off processes that didn't terminate properly

	printing	top
	newTileMorphRepresentative
	printOn: Refer to the comment in Object|printOn:.
	storeOn: Refer to the comment in Object|storeOn:.

	testing	top
	haltIfNil
	ifNil: A convenient test, in conjunction with Object ifNil:
	ifNil:ifNotNil: Evaluate the block for nil because I'm == nil
	ifNotNil: A convenient test, in conjunction with Object ifNotNil:
	ifNotNil:ifNil: If I got here, I am nil, so evaluate the block nilBlock
	ifNotNilDo: Override to do nothing.
	isEmptyOrNil Answer whether the receiver contains any elements, or is nil. Useful in numerous situations where one wishes the same reaction to an empty collection or to nil
	isLiteral Answer whether the receiver has a literal text form recognized by the compiler.
	isNil Refer to the comment in Object|isNil.
	notNil Refer to the comment in Object|notNil.

	instance creation	top
	initializedInstance Answer an instance of the receiver which in some sense is initialized. In the case of Morphs, this will yield an instance that can be attached to the Hand after having received the same kind of basic initialization that would be obtained from an instance chosen from the 'new morph' menu. Return nil if the receiver is reluctant for some reason to return such a thing
	new Answer a new instance of the receiver (which is a class) with no indexable variables. Fail if the class is indexable.