exit status: 1 with stderr:
<stdin>:10:7: error: type 'S' does not conform to protocol 'P1' class S: P2 { ^ <stdin>:3:20: note: protocol requires nested type 'A2'; do you want to add it? associatedtype A2 ^ <stdin>:10:7: error: type 'S' does not conform to protocol 'P2' class S: P2 { ^