iter.rs

#![feature(macro_rules)]

macro_rules! iter_magic(
    ($inp:expr => $($func:ident ($args:expr))=>+) => (
        $inp.iter()$(.$func($args))+
    );
)

fn main() {
    let b = "hello".as_bytes();
    for c in iter_magic!(b => 
                            map(|x| x) =>
                            filter(|&x| x % 2 == 0 ) 
                         ) {
        println!("{}", c);
    }
    
}