use non-zero clock id

Author: newpavlov

src/libstd/sys/wasi/thread.rs

@@ -31,7 +31,7 @@ impl Thread {
         assert!(nanos <= u64::max_value() as u128);
 
         let clock = wasi::raw::__wasi_subscription_u_clock_t {
-            identifier: 0,
+            identifier: 0x0123_45678,
             clock_id: wasi::CLOCK_MONOTONIC,
             timeout: nanos as u64,
             precision: 0,
@@ -47,7 +47,7 @@ impl Thread {
         let n = wasi::poll_oneoff(&in_, &mut out).unwrap();
         let wasi::Event { userdata, error, type_, .. } = out[0];
         match (n, userdata, error) {
-            (1, 0, 0) if type_ == wasi::EVENTTYPE_CLOCK => {}
+            (1, 0x0123_45678, 0) if type_ == wasi::EVENTTYPE_CLOCK => {}
             _ => panic!("thread::sleep(): unexpected result of poll_oneof"),
         }
     }