[swift-evolution] Consolidate Code for Each Case in Enum

[Anton Zhilin]

It would be nice if for each enum case, there was a computed property
returning an optional. Then you could do:

enum FooBar {
    case foo(Int)
    case bar(Int)
}
let x = FooBar.foo(42)
x.foo  //=> Optional(42)
x.bar  //=> nil

This feature has been discussed many times, but each time it was considered
“out of scope”.
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