See sample debug log attached.  This error will freeze the image if the
user attempts to 'debug' it instead of close its pre-debug window.

On 5/1/22 06:40, commits at source.squeak.org wrote:
> A new version of Tools was added to project The Inbox:
> http://source.squeak.org/inbox/Tools-lrnp.1148.mcz
> 
> ==================== Summary ====================
> 
> Name: Tools-lrnp.1148
> Author: lrnp
> Time: 1 May 2022, 12:40:47.313878 am
> UUID: b8cdb799-5e16-45e0-8ef6-cb592ee14b37
> Ancestors: Tools-tpr.1146
> 
> relax methodClass invariant for debuggers
> 
> In order to permit inspecting contexts of methods belonging to deleted classes while refactoring, do not require that CompiledMethod has a methodClass for debugger inspectors.
> 
> Resolves a masked MNU on #newParser in the debugger.
-------------- next part --------------
MessageNotUnderstood: UndefinedObject>>newParser
30 April 2022 11:04:57.843364 pm

VM: Mac OS - Smalltalk
Image: Squeak6.0alpha [latest update: #21674]

SecurityManager state:
Restricted: false
FileAccess: true
SocketAccess: true
Working Dir /Users/lauren/env/vm
Trusted Dir /Users/lauren/env/vm/secure
Untrusted Dir /Users/lauren/env/vm/My Squeak

UndefinedObject(Object)>>doesNotUnderstand: #newParser
	Receiver: nil
	Arguments and temporary variables: 
		aMessage: 	newParser
		exception: 	MessageNotUnderstood: UndefinedObject>>newParser
		resumeValue: 	nil
	Receiver's instance variables: 
nil
[] in CompiledMethod>>methodNode
	Receiver: (nil>>#build "a CompiledMethod(4118125)")
	Arguments and temporary variables: 
		aClass: 	nil
		source: 	a Text for 'build

	| msg |
	super build.

	msg := target peekInstructi...etc...
	Receiver's instance variables: 
(nil>>#build "a CompiledMethod(4118125)")
FullBlockClosure(BlockClosure)>>on:do:
	Receiver: [closure] in CompiledMethod>>methodNode
	Arguments and temporary variables: 
		exceptionOrExceptionSet: 	SyntaxErrorNotification
		handlerAction: 	[closure] in CompiledMethod>>methodNode
		handlerActive: 	true
		handlerRearmed: 	false
	Receiver's instance variables: 
		outerContext: 	CompiledMethod>>methodNode
		startpcOrMethod: 	([] in CompiledMethod>>#methodNode "a CompiledBlock(1693339)")...etc...
		numArgs: 	0
		receiver: 	(nil>>#build "a CompiledMethod(4118125)")

CompiledMethod>>methodNode
	Receiver: (nil>>#build "a CompiledMethod(4118125)")
	Arguments and temporary variables: 
		aClass: 	nil
		source: 	a Text for 'build

	| msg |
	super build.

	msg := target peekInstructi...etc...
	Receiver's instance variables: 
(nil>>#build "a CompiledMethod(4118125)")
[] in [] in DebuggerMethodMap class>>forMethod:
	Receiver: DebuggerMethodMap
	Arguments and temporary variables: 
		aMethod: 	(nil>>#build "a CompiledMethod(4118125)")
	Receiver's instance variables: 
		superclass: 	Object
		methodDict: 	a MethodDictionary(#abstractSourceMap->(DebuggerMethodMap>>#abstrac...etc...
		format: 	65542
		instanceVariables: 	#('timestamp' 'methodReference' 'methodNode' 'startKeysToBlo...etc...
		organization: 	('source mapping' abstractSourceMapForMethod: rangeForPC:in:contextIsActiveContext:...etc...
		subclasses: 	{DebuggerMethodMapForClosureCompiledMethods}
		name: 	#DebuggerMethodMap
		classPool: 	a Dictionary(#AccessLock->a Mutex() #MapCache->a WeakIdentityKeyDictionary...etc...
		sharedPools: 	nil
		environment: 	Smalltalk
		category: 	#'Tools-Debugger'

WeakIdentityKeyDictionary(Dictionary)>>at:ifAbsent:
	Receiver: a WeakIdentityKeyDictionary((BlockClosure>>#on:do: "a CompiledMethod(3469091)")->a DebuggerMethodMapForFullBlockCompiledMethods...etc...
	Arguments and temporary variables: 
		key: 	(nil>>#build "a CompiledMethod(4118125)")
		aBlock: 	[closure] in [] in DebuggerMethodMap class>>forMethod:
	Receiver's instance variables: 
		tally: 	17
		array: 	{nil . nil . nil . (TextEditor>>#evaluateSelection "a CompiledMethod(415...etc...
		finalizer: 	nil

WeakIdentityKeyDictionary(WeakKeyDictionary)>>at:ifAbsent:
	Receiver: a WeakIdentityKeyDictionary((BlockClosure>>#on:do: "a CompiledMethod(3469091)")->a DebuggerMethodMapForFullBlockCompiledMethods...etc...
	Arguments and temporary variables: 
		key: 	(nil>>#build "a CompiledMethod(4118125)")
		aBlock: 	[closure] in [] in DebuggerMethodMap class>>forMethod:
	Receiver's instance variables: 
		tally: 	17
		array: 	{nil . nil . nil . (TextEditor>>#evaluateSelection "a CompiledMethod(415...etc...
		finalizer: 	nil

[] in DebuggerMethodMap class>>forMethod:
	Receiver: DebuggerMethodMap
	Arguments and temporary variables: 
		aMethod: 	(nil>>#build "a CompiledMethod(4118125)")
	Receiver's instance variables: 
		superclass: 	Object
		methodDict: 	a MethodDictionary(#abstractSourceMap->(DebuggerMethodMap>>#abstrac...etc...
		format: 	65542
		instanceVariables: 	#('timestamp' 'methodReference' 'methodNode' 'startKeysToBlo...etc...
		organization: 	('source mapping' abstractSourceMapForMethod: rangeForPC:in:contextIsActiveContext:...etc...
		subclasses: 	{DebuggerMethodMapForClosureCompiledMethods}
		name: 	#DebuggerMethodMap
		classPool: 	a Dictionary(#AccessLock->a Mutex() #MapCache->a WeakIdentityKeyDictionary...etc...
		sharedPools: 	nil
		environment: 	Smalltalk
		category: 	#'Tools-Debugger'

FullBlockClosure(BlockClosure)>>ensure:
	Receiver: [closure] in DebuggerMethodMap class>>forMethod:
	Arguments and temporary variables: 
		aBlock: 	[closure] in Mutex>>critical:
		complete: 	nil
		returnValue: 	nil
	Receiver's instance variables: 
		outerContext: 	DebuggerMethodMap class>>forMethod:
		startpcOrMethod: 	([] in DebuggerMethodMap class>>#forMethod: "a CompiledBlock(1...etc...
		numArgs: 	0
		receiver: 	DebuggerMethodMap

Mutex>>critical:
	Receiver: a Mutex()
	Arguments and temporary variables: 
		aBlock: 	[closure] in DebuggerMethodMap class>>forMethod:
	Receiver's instance variables: 
		firstLink: 	nil
		lastLink: 	nil
		owner: 	a Process(90188) in nil

DebuggerMethodMap class>>protected:
	Receiver: DebuggerMethodMap
	Arguments and temporary variables: 
		aBlock: 	[closure] in DebuggerMethodMap class>>forMethod:
	Receiver's instance variables: 
		superclass: 	Object
		methodDict: 	a MethodDictionary(#abstractSourceMap->(DebuggerMethodMap>>#abstrac...etc...
		format: 	65542
		instanceVariables: 	#('timestamp' 'methodReference' 'methodNode' 'startKeysToBlo...etc...
		organization: 	('source mapping' abstractSourceMapForMethod: rangeForPC:in:contextIsActiveContext:...etc...
		subclasses: 	{DebuggerMethodMapForClosureCompiledMethods}
		name: 	#DebuggerMethodMap
		classPool: 	a Dictionary(#AccessLock->a Mutex() #MapCache->a WeakIdentityKeyDictionary...etc...
		sharedPools: 	nil
		environment: 	Smalltalk
		category: 	#'Tools-Debugger'

DebuggerMethodMap class>>forMethod:
	Receiver: DebuggerMethodMap
	Arguments and temporary variables: 
		aMethod: 	(nil>>#build "a CompiledMethod(4118125)")
	Receiver's instance variables: 
		superclass: 	Object
		methodDict: 	a MethodDictionary(#abstractSourceMap->(DebuggerMethodMap>>#abstrac...etc...
		format: 	65542
		instanceVariables: 	#('timestamp' 'methodReference' 'methodNode' 'startKeysToBlo...etc...
		organization: 	('source mapping' abstractSourceMapForMethod: rangeForPC:in:contextIsActiveContext:...etc...
		subclasses: 	{DebuggerMethodMapForClosureCompiledMethods}
		name: 	#DebuggerMethodMap
		classPool: 	a Dictionary(#AccessLock->a Mutex() #MapCache->a WeakIdentityKeyDictionary...etc...
		sharedPools: 	nil
		environment: 	Smalltalk
		category: 	#'Tools-Debugger'

CompiledMethod>>debuggerMap
	Receiver: (nil>>#build "a CompiledMethod(4118125)")
	Arguments and temporary variables: 

	Receiver's instance variables: 
(nil>>#build "a CompiledMethod(4118125)")
Context(InstructionStream)>>debuggerMap
	Receiver: AnObsoleteContextNextInstructionTile(nil)>>build
	Arguments and temporary variables: 

	Receiver's instance variables: 
		sender: 	UndefinedObject>>DoIt
		pc: 	70
		stackp: 	1
		method: 	(nil>>#build "a CompiledMethod(4118125)")
		closureOrNil: 	nil
		receiver: 	an AnObsoleteContextNextInstructionTile(3115615)

Context>>tempsAndValuesContractedTo:
	Receiver: AnObsoleteContextNextInstructionTile(nil)>>build
	Arguments and temporary variables: 
		width: 	64
	Receiver's instance variables: 
		sender: 	UndefinedObject>>DoIt
		pc: 	70
		stackp: 	1
		method: 	(nil>>#build "a CompiledMethod(4118125)")
		closureOrNil: 	nil
		receiver: 	an AnObsoleteContextNextInstructionTile(3115615)

[] in ContextVariablesInspector>>fieldAllTempVars
	Receiver: a ContextVariablesInspector
	Arguments and temporary variables: 
		object: 	AnObsoleteContextNextInstructionTile(nil)>>build
	Receiver's instance variables: 
		dependents: 	a DependentsArray(a PluggableListMorphPlus(2219511) a PluggableTextMorphPlus...etc...
		contents: 	a Text for '<An error occurred while inspecting this object. Click he...etc...
		object: 	AnObsoleteContextNextInstructionTile(nil)>>build
		context: 	nil
		fields: 	{an InspectorField<#self> named 'thisContext' . an InspectorField<#all>...etc...
		customFields: 	an OrderedCollection()
		selectionIndex: 	2
		expression: 	nil
		contentsTyped: 	nil
		fieldListStyler: 	a SHTextStylerST80
		shouldStyleValuePane: 	false
		selectionUpdateTime: 	0

InspectorField>>getValueFor:
	Receiver: an InspectorField<#all> named 'all temp vars'
	Arguments and temporary variables: 
		anInspector: 	a ContextVariablesInspector
	Receiver's instance variables: 
		key: 	#allTempVars
		valueGetter: 	[closure] in ContextVariablesInspector>>fieldAllTempVars
		valueGetterExpression: 	nil
		valueSetter: 	nil
		valueSetterExpression: 	nil
		name: 	a Text for 'all temp vars'
		shouldStyleName: 	nil
		shouldStyleValue: 	nil
		shouldPrintValueAsIs: 	true
		type: 	#all
		inspector: 	nil

ContextVariablesInspector(Inspector)>>selection
	Receiver: a ContextVariablesInspector
	Arguments and temporary variables: 

	Receiver's instance variables: 
		dependents: 	a DependentsArray(a PluggableListMorphPlus(2219511) a PluggableTextMorphPlus...etc...
		contents: 	a Text for '<An error occurred while inspecting this object. Click he...etc...
		object: 	AnObsoleteContextNextInstructionTile(nil)>>build
		context: 	nil
		fields: 	{an InspectorField<#self> named 'thisContext' . an InspectorField<#all>...etc...
		customFields: 	an OrderedCollection()
		selectionIndex: 	2
		expression: 	nil
		contentsTyped: 	nil
		fieldListStyler: 	a SHTextStylerST80
		shouldStyleValuePane: 	false
		selectionUpdateTime: 	0

[] in ContextVariablesInspector(Inspector)>>getContents
	Receiver: a ContextVariablesInspector
	Arguments and temporary variables: 
		newContents: 	nil
	Receiver's instance variables: 
		dependents: 	a DependentsArray(a PluggableListMorphPlus(2219511) a PluggableTextMorphPlus...etc...
		contents: 	a Text for '<An error occurred while inspecting this object. Click he...etc...
		object: 	AnObsoleteContextNextInstructionTile(nil)>>build
		context: 	nil
		fields: 	{an InspectorField<#self> named 'thisContext' . an InspectorField<#all>...etc...
		customFields: 	an OrderedCollection()
		selectionIndex: 	2
		expression: 	nil
		contentsTyped: 	nil
		fieldListStyler: 	a SHTextStylerST80
		shouldStyleValuePane: 	false
		selectionUpdateTime: 	0


--- The full stack ---
UndefinedObject(Object)>>doesNotUnderstand: #newParser
[] in CompiledMethod>>methodNode
FullBlockClosure(BlockClosure)>>on:do:
CompiledMethod>>methodNode
[] in [] in DebuggerMethodMap class>>forMethod:
WeakIdentityKeyDictionary(Dictionary)>>at:ifAbsent:
WeakIdentityKeyDictionary(WeakKeyDictionary)>>at:ifAbsent:
[] in DebuggerMethodMap class>>forMethod:
FullBlockClosure(BlockClosure)>>ensure:
Mutex>>critical:
DebuggerMethodMap class>>protected:
DebuggerMethodMap class>>forMethod:
CompiledMethod>>debuggerMap
Context(InstructionStream)>>debuggerMap
Context>>tempsAndValuesContractedTo:
[] in ContextVariablesInspector>>fieldAllTempVars
InspectorField>>getValueFor:
ContextVariablesInspector(Inspector)>>selection
[] in ContextVariablesInspector(Inspector)>>getContents
 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Time class>>microsecondsToRun:
Time class>>millisecondsToRun:
FullBlockClosure(BlockClosure)>>timeToRun
ContextVariablesInspector(Inspector)>>getContents
[] in ContextVariablesInspector(Inspector)>>updateContentsSafely
PluggableTextAttribute>>actOnClickFor:
PluggableTextAttribute(TextAttribute)>>actOnClickFor:in:
PluggableTextAttribute(TextAttribute)>>actOnClickFor:in:at:
PluggableTextAttribute(TextAttribute)>>actOnClickFor:in:at:editor:
[] in [] in NewParagraph>>clickAt:for:controller:
Utilities class>>awaitMouseUpIn:whileMouseDownDo:whileMouseDownInsideDo:ifSucceed:
Utilities class>>awaitMouseUpIn:repeating:ifSucceed:
[] in NewParagraph>>clickAt:for:controller:
Array(SequenceableCollection)>>do:
NewParagraph>>clickAt:for:controller:
SmalltalkEditor(TextEditor)>>mouseDown:
[] in TextMorphForEditView(TextMorph)>>mouseDown:
TextMorphForEditView(TextMorph)>>handleInteraction:fromEvent:
TextMorphForEditView>>handleInteraction:fromEvent:
TextMorphForEditView(TextMorph)>>mouseDown:
TextMorphForEditView>>mouseDown:
TextMorphForEditView(Morph)>>handleMouseDown:
MouseButtonEvent>>sentTo:
TextMorphForEditView(Morph)>>handleEvent:
MorphicEventDispatcher>>dispatchEvent:withHandler:withMorph:
[] in MorphicEventDispatcher>>dispatchMouseDown:with:
FullBlockClosure(BlockClosure)>>ensure:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
TextMorphForEditView(Morph)>>processEvent:using:
TextMorphForEditView(Morph)>>processEvent:
[] in MorphicEventDispatcher>>dispatchEvent:toSubmorphsOf:
Array(SequenceableCollection)>>do:
TransformMorph(Morph)>>submorphsDo:
MorphicEventDispatcher>>dispatchEvent:toSubmorphsOf:
MorphicEventDispatcher>>dispatchEvent:withHandler:withMorph:
[] in MorphicEventDispatcher>>dispatchMouseDown:with:
FullBlockClosure(BlockClosure)>>ensure:
MorphicEventDispatcher>>dispatchMouseDown:with:
MorphicEventDispatcher>>dispatchEvent:with:
TransformMorph(Morph)>>processEvent:using:
TransformMorph(Morph)>>processEvent:
-- and more not shown --