Macro tp 

macro_rules! tp {
    ($i:ident) => { ... };
    ($i:ident, $e:expr) => { ... };
    ($i:ident, $($arg:tt)*) => { ... };
}

tp! is to used to persist the tile into the tls (thread local storage), with a given name (string literal) and return a tile

use rtile::prelude::*;
tp!(
    tile_one,
    "
            one

            two
    "
);
tp!(
    tile_two,
    "
            three
            four
            five
    "
);
let input_tile = t!("
            @{tile_one} @{tile_two}
");
let output = input_tile.to_string();
let expected_output = ts!("
                         one three
                             four
                         two five
                         ");
assert_eq!(output, expected_output);