Macro datalist 

macro_rules! datalist {
    ($($all:tt)*) => { ... };
}

Example

use rtml::*;

assert_eq!(
    datalist![option!["option1"], option!["option2"], option!["option3"]].render(),
    "<datalist><option>option1</option><option>option2</option><option>option3</option></datalist>"
);