rust/src/test/run-pass/macro-2.rs

// xfail-pretty - token trees can't pretty print

fn main() {

    macro_rules! mylambda_tt(
        ($x:ident, $body:expr) => {
            fn f($x: int) -> int { return $body; };
            f
        }
    )

    assert(mylambda_tt!(y, y * 2)(8) == 16)
}