A new version of Kernel was added to project The Inbox:
http://source.squeak.org/inbox/Kernel-ct.1292.mcz

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

Name: Kernel-ct.1292
Author: ct
Time: 3 January 2020, 2:21:26.297116 am
UUID: 95936a10-85a4-734e-a10b-0f87290b70f9
Ancestors: Kernel-nice.1291

Proposal: Implement conditional exception handling on blocks. The nomenclature is inspired from usual practice in .NET languages.

For an impression of possible users, have a look at:

	self systemNavigation
		browseMessageList: ((self systemNavigation allCallsOn: #on:do: and: #pass) intersection: (#(ifTrue: ifFalse: ifTrue:ifFalse: ifFalse:ifTrue:) gather: [:sel | self systemNavigation allCallsOn: sel]))
		name: 'Potential users of #on:when:do:'

=============== Diff against Kernel-nice.1291 ===============

Item was added:
+ ----- Method: BlockClosure>>on:when:do: (in category 'exceptions') -----
+ on: exceptionOrExceptionSet when: aPredicate do: handlerAction
+ 
+ 	^ self
+ 		on: exceptionOrExceptionSet
+ 		do: [:exception |
+ 			(aPredicate value: exception)
+ 				ifTrue: [handlerAction cull: exception]
+ 				ifFalse: [exception pass]]!

Item was added:
+ ----- Method: BlockClosure>>on:when:ensure: (in category 'exceptions') -----
+ on: exceptionOrExceptionSet when: aPredicate ensure: aBlock
+ 
+ 	^ self
+ 		on: exceptionOrExceptionSet
+ 		do: [:exception |
+ 			(aPredicate value: exception)
+ 				ifTrue: [aBlock value].
+ 			exception pass]!