coverage: Extract `executor::block_on` from several async coverage tests

By moving `block_on` to an auxiliary crate, we avoid having to keep a separate
copy of it in every async test.

(This also incorporates some small tweaks to the headers in `await_ready.rs`.)

1 files changed, 3 insertions, 18 deletions

diff --git a/tests/coverage/async_block.rs b/tests/coverage/async_block.rs
index a70dd747032..7ae8241aa77 100644
--- a/tests/coverage/async_block.rs
+++ b/tests/coverage/async_block.rs
@@ -2,6 +2,9 @@
 #![feature(noop_waker)]
 //@ edition: 2021
 
+//@ aux-build: executor.rs
+extern crate executor;
+
 fn main() {
     for i in 0..16 {
         let future = async {
@@ -14,21 +17,3 @@ fn main() {
         executor::block_on(future);
     }
 }
-
-mod executor {
-    use core::future::Future;
-    use core::pin::pin;
-    use core::task::{Context, Poll, Waker};
-
-    #[coverage(off)]
-    pub fn block_on<F: Future>(mut future: F) -> F::Output {
-        let mut future = pin!(future);
-        let mut context = Context::from_waker(Waker::noop());
-
-        loop {
-            if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
-                break val;
-            }
-        }
-    }
-}