> On Aug 11, 2017, at 7:05 PM, David Zarzycki via swift-dev 
> <swift-dev@swift.org> wrote:
> Hi Slava,
> 
> Thanks. I’m not planning on seeking them out. I just want to minimize future 
> merge conflicts with an experimental branch I’m working on. The visitor 
> pattern helps people like me by minimizing the number of boilerplate updates 
> a person needs to do after adding a new type to the type system.

Unless you're splitting an existing type, most of the boilerplate updates are 
intentional — we want people to think about every case when doing the update.

John.
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