More directly, check out: https://github.com/apple/swift/blob/master/stdlib/public/core/Policy.swift https://github.com/apple/swift/blob/master/stdlib/public/co

More directly, check out: https://github.com/apple/swift/blob/master/stdlib/public/core/Policy.swift https://github.com/apple/swift/blob/master/stdlib/public/cor... Which is where much of the Swift "language" is defined... in the standard library. -Chris