gistfile1.txt

use to_str::ToStr;

macro_rules! map_cast(
    ($ty:ident, ~[$($arg:expr),+]) => (
        ~[$($arg as $ty),+]
    )
)

fn main() {
    let xs: ~[ToStr] = map_cast!(ToStr, ~[1, 2.5]);
    io::println(fmt!("%?", xs.map(|x| x.to_str())));
}