Execute the script below in a workspace in a virgin Squeak 3.6 image to
see the error.

----------------
Object
	subclass: #FooBase
	instanceVariableNames: ''
	classVariableNames: 'Bar'
	poolDictionaries: ''
	category: 'Scope-Examples'
.
(Smalltalk at: #FooBase)
	subclass: #FooSub
	instanceVariableNames: ''
	classVariableNames: ''
	poolDictionaries: ''
	category: 'Scope-Examples'
.
Object
	subclass: #Bar
	instanceVariableNames: ''
	classVariableNames: ''
	poolDictionaries: ''
	category: 'Scope-Examples'
.
(Smalltalk at: #FooBase) class compile:
'returnBar

^Bar'
.
(Smalltalk at: #FooBase) returnBar == nil
	ifFalse: [nil error: 'FooBase: should be nil']
.
(Smalltalk at: #FooSub) class compile:
'returnBar

^Bar'
.
(Smalltalk at: #FooSub) returnBar == nil
	ifFalse: [nil error: 'FooSub: should be nil']
----------------

13 October 2003 7:39:45 pm

VM: Win32 - Squeak3.5 of '11 April 2003' [latest update: #5180]
Image: Squeak3.6 [latest update: #5424]

UndefinedObject(Object)>>error:
	Receiver: nil
	Arguments and temporary variables: 
		aString: 	'FooSub: should be nil'
	Receiver's instance variables: 
nil

UndefinedObject>>DoIt
	Receiver: nil
	Arguments and temporary variables: 

	Receiver's instance variables: 
nil

Compiler>>evaluate:in:to:notifying:ifFail:
	Receiver: a Compiler
	Arguments and temporary variables: 
		textOrStream: 	a ReadWriteStream
		aContext: 	nil
		receiver: 	nil
		aRequestor: 	a TextMorphEditor
		failBlock: 	[] in TextMorphEditor(ParagraphEditor)>>evaluateSelection
		methodNode: 	DoIt
	Object
		subclass: #FooBase
		instanceVariableNames: ''
		cla...etc...
		method: 	a CompiledMethod (331)
		value: 	nil
	Receiver's instance variables: 
		sourceStream: 	a ReadWriteStream
		requestor: 	a TextMorphEditor
		class: 	UndefinedObject
		context: 	nil
		parserClass: 	Parser
		cacheDoItNode: 	true

[] in TextMorphEditor(ParagraphEditor)>>evaluateSelection
	Arguments and temporary variables: 
		result: 	nil
		rcvr: 	nil
		ctxt: 	nil
		ex: 	nil


--- The full stack ---
UndefinedObject(Object)>>error:
UndefinedObject>>DoIt
Compiler>>evaluate:in:to:notifying:ifFail:
[] in TextMorphEditor(ParagraphEditor)>>evaluateSelection
 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
BlockContext>>on:do:
TextMorphEditor(ParagraphEditor)>>evaluateSelection
[] in PluggableTextMorph>>doIt
[] in PluggableTextMorph>>handleEdit:
TextMorphForEditView(TextMorph)>>handleEdit:
PluggableTextMorph>>handleEdit:
PluggableTextMorph>>doIt
Workspace(StringHolder)>>perform:orSendTo:
[] in MenuItemMorph>>invokeWithEvent:
BlockContext>>ensure:
CursorWithMask(Cursor)>>showWhile:
MenuItemMorph>>invokeWithEvent:
MenuItemMorph>>mouseUp:
MenuItemMorph>>handleMouseUp:
MouseButtonEvent>>sentTo:
MenuItemMorph(Morph)>>handleEvent:
MorphicEventDispatcher>>dispatchDefault:with:
MorphicEventDispatcher>>dispatchEvent:with:
MenuItemMorph(Morph)>>processEvent:using:
MorphicEventDispatcher>>dispatchDefault:with:
MorphicEventDispatcher>>dispatchEvent:with:
MenuMorph(Morph)>>processEvent:using:
MenuMorph(Morph)>>processEvent:
MenuMorph>>handleFocusEvent:
[] in HandMorph>>sendFocusEvent:to:clear:
PasteUpMorph>>becomeActiveDuring:
HandMorph>>sendFocusEvent:to:clear:
HandMorph>>sendEvent:focus:clear:
HandMorph>>sendMouseEvent:
HandMorph>>handleEvent:
HandMorph>>processEvents
[] in WorldState>>doOneCycleNowFor:
Array(SequenceableCollection)>>do:
WorldState>>handsDo:
WorldState>>doOneCycleNowFor:
WorldState>>doOneCycleFor:
WorldState>>doOneSubCycleFor:
PasteUpMorph>>doOneSubCycle
MenuMorph>>invokeModalAt:in:allowKeyboard:
MenuMorph>>invokeModal:
PluggableTextMorph>>yellowButtonActivity:
TextMorphForEditView>>mouseDown:
TextMorphForEditView(Morph)>>handleMouseDown:
MouseButtonEvent>>sentTo:
TextMorphForEditView(Morph)>>handleEvent:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
TextMorphForEditView(Morph)>>processEvent:using:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
TransformMorph(Morph)>>processEvent:using:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
PluggableTextMorph(Morph)>>processEvent:using:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
SystemWindow(Morph)>>processEvent:using:
-- and more not shown --