fn as_str(&self) -> &str {
        match *self {
            Token::LParen => "(",
            Token::RParen => ")",
            Token::Div => "/",
            Token::Mul => "*",
            Token::Pow => "^",
            Token::Value(ref value) => value,
        }
    }
/// Get the string used to build this token in tokenize
Get the string used to build this token in tokenize
Get the string used to build this token in tokenize
fn as_str(&self) -> &str {
        match *self {
            Token::LParen => "(",
            Token::RParen => ")",
            Token::Div => "/",
            Token::Mul => "*",
            Token::Pow => "^",
            Token::Value(ref value) => value,
        }
    }
fn as_str ( & self ) -> & str { match * self { Token :: LParen => " " , Token :: RParen => " " , Token :: Div => " " , Token :: Mul => " " , Token :: Pow => " " , Token :: Value ( ref value ) => value , } }
Get the string used to build this token in tokenize
Get the string used to build this token in tokenize
&self