 4> typealias A = (a: Int, b: Int) 5> A(a: 2, b: 3) $R0: (a: Int, b: Int) = { a = 2 b = 3 } 6> A.init(a: 2, b: 3) error: repl.swift:6:1: error: type 'A' (aka '(a: Int, b: Int)') has no member 'init' A.init(a: 2, b: 3) ^ ~~~~