// `sleep(ms)` rejects a NEGATIVE duration loudly — the virtual clock is
// monotonic (advances only as timers fire), so a negative deadline would rewind
// it and break every ordering contract. Regression (B1.4b review, P2-c): the
// guard aborts instead of silently arming a past deadline.
//
// aborts (exit 134) after the diagnostic — aarch64-macOS-pinned.
#import "modules/std.sx";
sched :: #import "modules/std/sched.sx";
main :: () -> i64 {
    s := sched.Scheduler.init(); ps := @s;
    ps.spawn(() => { ps.sleep(10); ps.sleep(-5); });   // -5 → loud abort
    s.run();
    print("unreachable\n");
    return 0;
}