rust/src/test/run-pass/extern-crosscrate.rs

// xfail-fast
//aux-build:extern-crosscrate-source.rs

use externcallback(vers = "0.1");

fn fact(n: uint) -> uint {
    debug!{"n = %?", n};
    externcallback::rustrt::rust_dbg_call(externcallback::cb, n)
}

fn main() {
    let result = fact(10u);
    debug!{"result = %?", result};
    assert result == 3628800u;
}