[swift-evolution] Pitch: Deprecate/remove AnyObject method dispatch

[Johannes Weiß]

yes, please. Especially having quite a long time (4.1 until 5.0) where this works but issues a warning sounds like a great transition plan.

> On 24 Oct 2017, at 11:02 pm, Slava Pestov via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hi all,
> 
> Dynamic dispatch of methods through AnyObject is a source of implementation complexity, has many known bugs which we are not going to fix, and no longer makes sense now in an id-as-Any world; AnyObject is not the ‘common currency’ type for arbitrary Objective-C objects anymore.
> 
> I would like to propose we deprecate it as follows:
> 
> - Unconditional warning in Swift 4.1, with a fixit to add an ‘as’ cast to cast the base value to the right type
> - Error in Swift 5 in -swift-version 5 mode
> 
> Thoughts? Does anyone actually rely on this feature, instead of just stumbling on it by accident once in a while?
> 
> Slava
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