解析列, 表

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#[derive(Debug)] enum Cell{     s(String),     f(f64),     i(i64),     b(bool) }   #[derive(Debug)] struct Col{     title:String,     data:Vec<Cell> }   type DataFrame = Vec<Col>;   trait Build{     fn new(self)->Cell; }   impl Build for &str{     fn new(self) ->Cell {         Cell::s(self.to_string())     } }   impl Build for i64 {     fn new(self)->Cell {         Cell::i(self)     } }   impl Build for f64 {     fn new(self)->Cell {         Cell::f(self)     } }   macro_rules! series {     () => {         Col{             title:"A".to_string(),             data: vec![]         }     };     ($t:expr => [$($c:expr), *]) => {         Col{             title:String::from($t),             data: vec![$(Build::new($c),)*]         }       } }   macro_rules! df {     ()=>{         vec![]     };     ($($t:expr => [$($c:expr),*]),*) =>{         vec![             $(Col{                 title:String::from($t),                 data: vec![$(Build::new($c),)*]             },)*         ]     } }   fn main(){    let  df = df!["A"=>[1,2,2.2,"first"], "B"=>[3.3,1,"second"]];     println!("{:?}", df);     }