Colin Putney uploaded a new version of Environments to project The Trunk:
http://source.squeak.org/trunk/Environments-cwp.44.mcz

==================== Summary ====================

Name: Environments-cwp.44
Author: cwp
Time: 4 January 2014, 6:05:07.717 pm
UUID: b56ef524-2bcf-4efb-92ff-6c065b7cc771
Ancestors: Environments-cwp.43

Make #bindingOf:ifAbsent: ignore undeclared bindings, per Levente's insight.

=============== Diff against Environments-cwp.43 ===============

Item was changed:
  ----- Method: Environment>>bindingOf:ifAbsent: (in category 'binding') -----
  bindingOf: aSymbol ifAbsent: aBlock
+ 	^ bindings bindingOf: aSymbol ifAbsent: aBlock!
- 	^ bindings bindingOf: aSymbol ifAbsent:
- 		[undeclared bindingOf: aSymbol ifAbsent: aBlock]!

Item was changed:
  ----- Method: Environment>>forgetClass:logged: (in category 'classes and traits') -----
  forgetClass: aClass logged: aBool
  	| binding |
  	self flag: #review.
+ 	"The class might not bound to its name"
  	
  	aBool ifTrue: 
  		[SystemChangeNotifier uniqueInstance 
  			classRemoved: aClass fromCategory: aClass category].
  		
  	binding := declarations bindingOf: aClass name.
  	binding ifNotNil:
  		[self organization removeElement: aClass name.
  		Smalltalk removeFromStartUpList: aClass.
  		Smalltalk removeFromShutDownList: aClass.
  	
  		undeclared declare: aClass name from: declarations.
  		declarations removeKey: aClass name ifAbsent: [].
  		[undeclared at: aClass name put: nil]
  			on: AttemptToWriteReadOnlyGlobal
  			do: [:n | n resume: true].
  		self binding: binding removedFrom: self]
  !

Item was changed:
+ ----- Method: Environment>>poolUsers (in category 'emulating') -----
- ----- Method: Environment>>poolUsers (in category 'as yet unclassified') -----
  poolUsers
  	"Answer a dictionary of pool name -> classes that refer to it.
  	Also includes any globally know dictionaries (such as
  	Smalltalk, Undeclared etc) which although not strictly
  	accurate is potentially useful information"
  	"Smalltalk poolUsers"
  	| poolUsers |
  	poolUsers := Dictionary new.
  	self keys
  		do: [:k | "yes, using isKindOf: is tacky but for reflective code like
  			this it is very useful. If you really object you can:-
  			a) go boil your head.
  			b) provide a better answer.
  			your choice."
  			| pool refs |
  			(((pool := self at: k) isKindOf: Dictionary)
  					or: [pool isKindOf: SharedPool class])
  				ifTrue: [refs := (self systemNavigation allClasses
  								select: [:c | c sharedPools identityIncludes: pool]
  								thenCollect: [:c | c name]) asOrderedCollection.
  					refs
  						add: (self systemNavigation
  								allCallsOn: (self associationAt: k)).
  					poolUsers at: k put: refs]].
  	^ poolUsers!