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there is no source code, yet.
Right now there is!: https://github.com/apple/swift Also, the dependencies to build swift looks fine to build it on other architectures. I'll try to build it for the Raspberry Pi 2 to see.
I haven't gotten it to build yet, maybe I should read the manual, but I'm a man, damnit, so I'll do that once I've tried absolutely everything else.