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//@ run-pass
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
pub fn rust_dbg_call(
cb: extern "C" fn(u64) -> u64,
data: u64,
) -> u64;
}
extern "C" fn cb(data: u64) -> u64 {
if data == 1 { data } else { fact(data - 1) * data }
}
fn fact(n: u64) -> u64 {
unsafe {
println!("n = {}", n);
rust_dbg_call(cb, n)
}
}
pub fn main() {
let result = fact(10);
println!("result = {}", result);
assert_eq!(result, 3628800);
}
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