Note that VA Smalltalk has a legacy approach to exceptions that precedes the ANSI standard. It uses #when:do: in place of #on:do:. (Nowadays it also supports #on:do: but not for old-style exceptions in applications.) Might not a blocker for the proposed nomenclature, but you should at least be aware of it.
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]!