Clarify what NoopWaker does (#819)

tokio-rs · Jan 2, 2019 · 30f5967 · 30f5967
1 parent 9e4ddae
commit 30f5967
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/tokio-async-await/src/compat/backward.rs b/tokio-async-await/src/compat/backward.rs
@@ -84,6 +84,6 @@ unsafe impl UnsafeWake for NoopWaker {
     }
 
     unsafe fn wake(&self) {
-        panic!("NoopWake cannot wake");
+        unimplemented!("async-await-preview currently only supports futures 0.1. Use the compatibility layer of futures 0.3 instead, if you want to use futures 0.3.");
     }
 }