---

yaml
---
r: 6405
b: refs/heads/master
c: d6ab8eb
h: refs/heads/master
i:
  6403: 4354fe5
v: v3

Author: brson

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9aa67052e17705ee8175505836a2fa0117f044fe
+refs/heads/master: d6ab8ebb07d0f6360d2aa32dec71c24a32c21ea6

trunk/src/rt/rust_builtin.cpp

@@ -508,8 +508,8 @@ chan_id_send(type_desc *t, rust_task_id target_task_id,
     return (uintptr_t)sent;
 }
 
-// This is called by an intrinsic on the Rust stack.
-// Do not call on the C stack.
+// This is called by an intrinsic on the Rust stack and must run
+// entirely in the red zone. Do not call on the C stack.
 extern "C" CDECL void
 rust_task_sleep(rust_task *task, size_t time_in_us, bool *killed) {
     task->yield(time_in_us, killed);