exit status: 1 with stderr:
<stdin>:10:6: error: enum case 'a' cannot be used as an instance member .a(.none) ~^~~~~~~~ E <stdin>:11:6: error: enum case 'a' cannot be used as an instance member .a(.some(.none)) ~~~~~^~~~~~~~~~~~~~~ E <stdin>:12:6: error: enum case 'a' cannot be used as an instance member .a(.some(.some(.none))) ~~~~~^~~~~~~~~~~~~~~~~~~~~~ E