Swift version 4.1 (swift-4.1-RELEASE) Target: x86_64-unknown-linux-gnu true true true /usercode/main.swift:9:14: warning: 'is' test is always true print(S.self is A.Type) ^ /usercode/main.swift:10:14: warning: 'is' test is always true print(S.self is B.Type) ^ /usercode/main.swift:11:14: warning: 'is' test is always true print(S.self is C.Type) ^