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// run-pass
// ignore-wasm32-bare no libc to test ffi with
#![feature(rustc_private)]
extern crate libc;
mod rustrt {
extern crate libc;
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
pub fn rust_dbg_call(
cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t,
data: libc::uintptr_t,
) -> libc::uintptr_t;
}
}
extern "C" fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
if data == 1 { data } else { fact(data - 1) * data }
}
fn fact(n: libc::uintptr_t) -> libc::uintptr_t {
unsafe {
println!("n = {}", n);
rustrt::rust_dbg_call(cb, n)
}
}
pub fn main() {
let result = fact(10);
println!("result = {}", result);
assert_eq!(result, 3628800);
}
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