A simple example of a new error handling concept in Go

error_handling_example.go

func Caller(arg int) {
    result := SomeFunction(arg) on_error e {
        fmt.Printf("Wrong input: %v", e)
        return
    }
    fmt.Printf("Result: %v", result)
}

func SomeFunction(arg int) int fails_with error {
    if arg == 42 {
        fail errors.New("Can't work with 42")
    }
    return arg + 3
}