[swift-evolution] SE-0030 Property behaviours

[Антон Жилин]

An idea for future directions (quite obvious, but not yet discussed).
Extract current computed properties into a library behaviour, that is,
convert

var x: Int {
   get { ... }
   set { ... }
}

To

@computed var x: Int {
   get { ... }
   set { ... }
}

This is closely related to discussion of removal of `if let x = ...` in
favor of `if let x? = ...`
Intentions are the same: remove extra entities and simplify grammar.

What do we do with read-only computed properties? Defaulting set accessor
to fatalError() is not really a solution.

P.S. The initial email was blocked by Mailman, don't respond to it, please.
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