// This time we're testing repeatedly going up and down both stacks to // make sure the stack pointers are maintained properly in both // directions native mod rustrt { fn rust_dbg_call(cb: *u8, data: libc::uintptr_t) -> libc::uintptr_t; } crust fn cb(data: libc::uintptr_t) -> libc::uintptr_t { if data == 1u { data } else { count(data - 1u) + count(data - 1u) } } fn count(n: uint) -> uint { #debug("n = %?", n); rustrt::rust_dbg_call(cb, n) } fn main() { // Make sure we're on a task with small Rust stacks (main currently // has a large stack) do task::spawn {|| let result = count(12u); #debug("result = %?", result); assert result == 2048u; }; }