@noescape attribute in Swift 1.2

There is a new attribute in Swift 1.2 with closure parameters in functions, and as the documentation says: This indicates that the parameter is only ever called (or passed as an @ noescape parameter in a call), which means that it cannot outlive the lifetime of the call. In my understanding, before that, we could use [weak self] to not let the closure to have a strong reference to e.g. its class,

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Swift 1.2で追加された @noescape について。リリースノートにもあった。