Optional(main.Hoge) main.Hogestderr:

<stdin>:4:19: warning: expression implicitly coerced from 'Hoge?' to 'Any' print(self) ^~~~ <stdin>:4:19: note: provide a default value to avoid this warning print(self) ^~~~ ?? <#default value#> <stdin>:4:19: note: force-unwrap the value to avoid this warning print(self) ^~~~ ! <stdin>:4:19: note: explicitly cast to 'Any' with 'as Any' to silence this warning print(self) ^~~~ as Any

(edited)