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Now in beta 4, they added access modifiers to Swift.

from XCode 6 beta 4 realese notes:

Swift access control has three access levels:

• private entities can only be accessed from within the source file where they are defined.
• internal entities can be accessed anywhere within the target where they are defined.
• public entities can be accessed from anywhere within the target and from any other context that imports the current target’s module.

By default, most entities in a source file have internal access. This allows application developers to largely ignore access control while allowing framework developers full control over a framework's API.