Main.hx:10: characters 18-19 : Field a has different type than in A
Main.hx:2: characters 2-29 : ... Interface field is defined here
Main.hx:10: characters 18-19 : ... error: Int should be String
Main.hx:10: characters 18-19 : ... have: (...) -> Int
Main.hx:10: characters 18-19 : ... want: (...) -> String