Rollup merge of #61138 - varkor:async-await-tests, r=cramertj

Move async/await tests to their own folder

This moves run-pass and ui async/await tests to their own folder `src/test/ui/async-await` and organises some into subfolders. (It does not move rustdoc tests for async/await.)

I also did some drive-by cleaning up of issues/error code tests into their own folders (which already existed). These are in separate commits, so easy to separate out if that's more desirable.

r? @cramertj

Author: Centril

src/test/run-pass/async-await.rs src/test/ui/async-await/async-await.rs

@@ -1,3 +1,5 @@
+// run-pass
+
 // edition:2018
 // aux-build:arc_wake.rs
 

src/test/ui/async-fn-multiple-lifetimes.rs src/test/ui/async-await/async-fn-multiple-lifetimes.rs

@@ -1,3 +1,5 @@
+// run-pass
+
 // edition:2018
 // aux-build:arc_wake.rs
 

src/test/ui/async-fn-multiple-lifetimes.stderr src/test/ui/async-await/async-fn-multiple-lifetimes.stderr

@@ -0,0 +1,64 @@
+// edition:2018
+
+use std::sync::Arc;
+use std::task::{
+    Waker, RawWaker, RawWakerVTable,
+};
+
+macro_rules! waker_vtable {
+    ($ty:ident) => {
+        &RawWakerVTable::new(
+            clone_arc_raw::<$ty>,
+            wake_arc_raw::<$ty>,
+            wake_by_ref_arc_raw::<$ty>,
+            drop_arc_raw::<$ty>,
+        )
+    };
+}
+
+pub trait ArcWake {
+    fn wake(self: Arc<Self>);
+
+    fn wake_by_ref(arc_self: &Arc<Self>) {
+        arc_self.clone().wake()
+    }
+
+    fn into_waker(wake: Arc<Self>) -> Waker where Self: Sized
+    {
+        let ptr = Arc::into_raw(wake) as *const ();
+
+        unsafe {
+            Waker::from_raw(RawWaker::new(ptr, waker_vtable!(Self)))
+        }
+    }
+}
+
+unsafe fn increase_refcount<T: ArcWake>(data: *const ()) {
+    // Retain Arc by creating a copy
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    let arc_clone = arc.clone();
+    // Forget the Arcs again, so that the refcount isn't decrased
+    let _ = Arc::into_raw(arc);
+    let _ = Arc::into_raw(arc_clone);
+}
+
+unsafe fn clone_arc_raw<T: ArcWake>(data: *const ()) -> RawWaker {
+    increase_refcount::<T>(data);
+    RawWaker::new(data, waker_vtable!(T))
+}
+
+unsafe fn drop_arc_raw<T: ArcWake>(data: *const ()) {
+    // Drop Arc
+    let _: Arc<T> = Arc::from_raw(data as *const T);
+}
+
+unsafe fn wake_arc_raw<T: ArcWake>(data: *const ()) {
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    ArcWake::wake(arc);
+}
+
+unsafe fn wake_by_ref_arc_raw<T: ArcWake>(data: *const ()) {
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    ArcWake::wake_by_ref(&arc);
+    let _ = Arc::into_raw(arc);
+}

src/test/ui/async-fn-path-elision.rs src/test/ui/async-await/async-fn-path-elision.rs

@@ -1,7 +1,9 @@
-#![feature(async_await)]
-#![allow(unused_parens)]
+// run-pass
 
 // edition:2018
 // pp-exact
 
+#![feature(async_await)]
+#![allow(unused_parens)]
+
 fn main() { let _a = (async  { }); }

src/test/ui/async-fn-path-elision.stderr src/test/ui/async-await/async-fn-path-elision.stderr

@@ -1,3 +1,5 @@
+// run-pass
+
 // compile-flags: --edition=2018
 
 #![feature(async_await, await_macro)]