[swift-evolution] Proposal: Introduce User-defined "Dynamic Member Lookup" Types

[Chris Lattner]

I’d like to formally propose the inclusion of user-defined dynamic member lookup types.

Here is my latest draft of the proposal:
https://gist.github.com/lattner/b016e1cf86c43732c8d82f90e5ae5438
https://github.com/apple/swift-evolution/pull/768

An implementation of this design is available here:
https://github.com/apple/swift/pull/13076

The implementation is straight-forward and (IMO) non-invasive in the compiler.

-Chris