exit status: 1 with stderr:
<stdin>:21:15: error: invalid redeclaration of 'Y' typealias Y = String ^ <stdin>:17:15: note: 'Y' previously declared here typealias Y = Int ^ <stdin>:16:1: error: type 'M<T>' does not conform to protocol 'B' extension M: B where X == Int { ^ <stdin>:5:20: note: multiple matching types named 'Y' associatedtype Y ^ <stdin>:17:15: note: possibly intended match typealias Y = Int ^ <stdin>:21:15: note: possibly intended match typealias Y = String ^ <stdin>:20:1: error: type 'M<T>' does not conform to protocol 'C' extension M: C where X == String { ^ <stdin>:9:20: note: multiple matching types named 'Y' associatedtype Y ^ <stdin>:17:15: note: possibly intended match typealias Y = Int ^ <stdin>:21:15: note: possibly intended match typealias Y = String ^