duke@1: T6241723.java:21:5: compiler.warn.has.been.deprecated: A1, unnamed package
duke@1: T6241723.java:23:7: compiler.warn.has.been.deprecated: A2.A21, A2
duke@1: T6241723.java:26:5: compiler.warn.has.been.deprecated: Z1, unnamed package
duke@1: T6241723.java:28:7: compiler.warn.has.been.deprecated: Z2.Z21, Z2
duke@1: 4 warnings