[swift-evolution] [Pitch #2] Introduce User-defined "Dynamic Member Lookup" Types

[Brent Royal-Gordon]

> On Nov 25, 2017, at 3:16 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Just to talk to myself a bit here, but I’ve come to realize that the right design really is to have a simple empty marker protocol like this:

If you're reaching this point. why have a marker protocol at all? Why not treat `subscript(dynamicMember:)` specially on any type that has it, or have an `@dynamicMember subscript(_:)` attribute, or introduce an entire new `dynamicMember(_:)` declaration?

-- 
Brent Royal-Gordon
Architechies

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