exit status: 1 with stderr:
<stdin>:2:42: error: non-protocol, non-class type 'T' cannot be used within a protocol-constrained type func f<T>(_ x: Any, _ t: T.Type) -> (P & T)? { ^ <stdin>:2:42: error: non-protocol, non-class type 'T' cannot be used within a protocol-constrained type func f<T>(_ x: Any, _ t: T.Type) -> (P & T)? { ^ <stdin>:3:22: error: non-protocol, non-class type 'T' cannot be used within a protocol-constrained type return x as? P & T ^
(edited)