exit status: 1 with stderr:
<stdin>:3:15: error: definition conflicts with previous value guard let a = a else { return } ^ <stdin>:2:9: note: previous definition of 'a' is here let a: Int? = 42 ^ <stdin>:4:11: warning: expression implicitly coerced from 'Int?' to 'Any' print(a) ^ <stdin>:4:11: note: provide a default value to avoid this warning print(a) ^ ?? <#default value#> <stdin>:4:11: note: force-unwrap the value to avoid this warning print(a) ^ ! <stdin>:4:11: note: explicitly cast to 'Any' with 'as Any' to silence this warning print(a) ^ as Any <stdin>:3:15: warning: value 'a' was defined but never used; consider replacing with boolean test guard let a = a else { return } ~~~~^~~~ != nil