[swift-evolution] Normalize Enum Case Representation (rev. 2)

[Joe Groff]

> On Mar 9, 2017, at 5:59 AM, Matthew Johnson via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I have argued repeatedly that enum cases play two distinct roles (and sometimes a third in the future).  We need to embrace all of these roles.  This proposal primarily normalizes the role of case-as-factory-method.  
> 
> Pattern matching is a second role enum cases play.  We already have syntax for patterns that match based on type.  I see no reason we should introduce new matching syntax to disambiguate overloaded cases.  The existing patterns work well for this purpose.  Matching should be considered a role played by enum cases that is completely orthogonal to their role as a factory method.

Matching and construction are closely related and designed to mimic each other. They aren't completely orthogonal.

-Joe

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