14     struct Opt {  in required_option()  struct
16         arg: i32,  in required_option()
39     struct Opt {  in optional_option()  struct
41         arg: Option<i32>,  in optional_option()
59     struct Opt {  in option_with_default()  struct
61         arg: i32,  in option_with_default()
79     struct Opt {  in option_with_raw_default()  struct
81         arg: i32,  in option_with_raw_default()
99     struct Opt {  in options()  struct
101         arg: Vec<i32>,  in options()
120     struct Opt {  in empy_default_value()  struct
122         arg: String,  in empy_default_value()
143     struct Opt {  in option_from_str()  struct
145         a: Option<A>,  in option_from_str()
155     struct Opt {  in optional_argument_for_optional_option()  struct
158         arg: Option<Option<i32>>,  in optional_argument_for_optional_option()
183     struct Opt {  in two_option_options()  struct
185         arg: Option<Option<i32>>,  in two_option_options()
188         field: Option<Option<String>>,  in two_option_options()
237     struct Opt {  in optional_vec()  struct
239         arg: Option<Vec<i32>>,  in optional_vec()
300     struct Opt {  in two_optional_vecs()  struct
302         arg: Option<Vec<i32>>,  in two_optional_vecs()
305         b: Option<Vec<i32>>,  in two_optional_vecs()