派生显示
Display特征的派生对象。
#[macro_use] extern crate display_derive;
#[derive(Display)]
#[display(fmt = "Error code: {}" , code)]
struct RecordError {
code: u32 ,
}
#[derive(Display)]
enum EnumError {
#[display(fmt = "Error code: {}" , code)]
StructVariant {
code: i32 ,
},
#[display(fmt = "Error: {}" , _0)]
TupleVariant (& ' static str ),
#[display(fmt = "An error has
