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.

<commits at source.squeak.org> schrieb am Fr., 3. Jan. 2020, 02:21:

> 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]!
>
>
>
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