Is Allowing Multiple Type aliases in a Single Declaration for consistency let and var declarations a good idea? (Github Issue #48100)(SR-5528)

Evolution Discussion
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7

That can't be used with defaults, which match what type aliases look like.

protocol P {
  associatedtype A = Encodable & Decodable // Compiles
  associatedtype B = Encodable, Decodable // Two errors
}

What I meant was, you can't do this:

protocol P {
  associatedtype A = AnyObject, B = Bool
}