Swift version 4.1 (swift-4.1-RELEASE)/usercode/main.swift:9:7: warning: will never be executed print(a) ^ /usercode/main.swift:7:16: note: a call to a never-returning function let a: Never = nil ^ /usercode/main.swift:2:12: warning: will never be executed public init(nilLiteral: ()) { ^ /usercode/main.swift:2:12: note: a call to a never-returning function public init(nilLiteral: ()) { ^ Segmentation fault (core dumped)