Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 2014 insertions, 0 deletions

diff --git a/third_party/rust/async-trait/tests/compiletest.rs b/third_party/rust/async-trait/tests/compiletest.rs
new file mode 100644
index 0000000000..7974a6249e
--- /dev/null
+++ b/third_party/rust/async-trait/tests/compiletest.rs
@@ -0,0 +1,7 @@
+#[rustversion::attr(not(nightly), ignore)]
+#[cfg_attr(miri, ignore)]
+#[test]
+fn ui() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail("tests/ui/*.rs");
+}
diff --git a/third_party/rust/async-trait/tests/executor/mod.rs b/third_party/rust/async-trait/tests/executor/mod.rs
new file mode 100644
index 0000000000..912fb79844
--- /dev/null
+++ b/third_party/rust/async-trait/tests/executor/mod.rs
@@ -0,0 +1,36 @@
+use std::future::Future;
+use std::pin::Pin;
+use std::ptr;
+use std::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
+
+// Executor for a future that resolves immediately (test only).
+#[allow(clippy::missing_panics_doc)]
+pub fn block_on_simple<F: Future>(mut fut: F) -> F::Output {
+    unsafe fn clone(_null: *const ()) -> RawWaker {
+        unimplemented!()
+    }
+
+    unsafe fn wake(_null: *const ()) {
+        unimplemented!()
+    }
+
+    unsafe fn wake_by_ref(_null: *const ()) {
+        unimplemented!()
+    }
+
+    unsafe fn drop(_null: *const ()) {}
+
+    let data = ptr::null();
+    let vtable = &RawWakerVTable::new(clone, wake, wake_by_ref, drop);
+    let raw_waker = RawWaker::new(data, vtable);
+    let waker = unsafe { Waker::from_raw(raw_waker) };
+    let mut cx = Context::from_waker(&waker);
+
+    // fut does not move until it gets dropped.
+    let fut = unsafe { Pin::new_unchecked(&mut fut) };
+
+    match fut.poll(&mut cx) {
+        Poll::Ready(output) => output,
+        Poll::Pending => panic!("future did not resolve immediately"),
+    }
+}
diff --git a/third_party/rust/async-trait/tests/test.rs b/third_party/rust/async-trait/tests/test.rs
new file mode 100644
index 0000000000..23d8f801fd
--- /dev/null
+++ b/third_party/rust/async-trait/tests/test.rs
@@ -0,0 +1,1463 @@
+#![cfg_attr(
+    async_trait_nightly_testing,
+    feature(min_specialization, type_alias_impl_trait)
+)]
+#![allow(
+    clippy::let_unit_value,
+    clippy::missing_panics_doc,
+    clippy::missing_safety_doc,
+    clippy::needless_return,
+    clippy::trivially_copy_pass_by_ref,
+    clippy::unused_async
+)]
+
+use async_trait::async_trait;
+
+pub mod executor;
+
+// Dummy module to check that the expansion refer to rust's core crate
+mod core {}
+
+#[async_trait]
+trait Trait {
+    type Assoc;
+
+    async fn selfvalue(self)
+    where
+        Self: Sized,
+    {
+    }
+
+    async fn selfref(&self) {}
+
+    async fn selfmut(&mut self) {}
+
+    async fn required() -> Self::Assoc;
+
+    async fn elided_lifetime(_x: &str) {}
+
+    async fn explicit_lifetime<'a>(_x: &'a str) {}
+
+    async fn generic_type_param<T: Send>(x: Box<T>) -> T {
+        *x
+    }
+
+    async fn calls(&self) {
+        self.selfref().await;
+        Self::elided_lifetime("").await;
+        <Self>::elided_lifetime("").await;
+    }
+
+    async fn calls_mut(&mut self) {
+        self.selfmut().await;
+    }
+}
+
+struct Struct;
+
+#[async_trait]
+impl Trait for Struct {
+    type Assoc = ();
+
+    async fn selfvalue(self) {}
+
+    async fn selfref(&self) {}
+
+    async fn selfmut(&mut self) {}
+
+    async fn required() -> Self::Assoc {}
+
+    async fn elided_lifetime(_x: &str) {}
+
+    async fn explicit_lifetime<'a>(_x: &'a str) {}
+
+    async fn generic_type_param<T: Send>(x: Box<T>) -> T {
+        *x
+    }
+
+    async fn calls(&self) {
+        self.selfref().await;
+        Self::elided_lifetime("").await;
+        <Self>::elided_lifetime("").await;
+    }
+
+    async fn calls_mut(&mut self) {
+        self.selfmut().await;
+    }
+}
+
+pub async fn test() {
+    let mut s = Struct;
+    s.selfref().await;
+    s.selfmut().await;
+    s.selfvalue().await;
+
+    Struct::required().await;
+    Struct::elided_lifetime("").await;
+    Struct::explicit_lifetime("").await;
+    Struct::generic_type_param(Box::new("")).await;
+
+    let mut s = Struct;
+    s.calls().await;
+    s.calls_mut().await;
+}
+
+pub async fn test_object_safe_without_default() {
+    #[async_trait]
+    trait ObjectSafe {
+        async fn f(&self);
+    }
+
+    #[async_trait]
+    impl ObjectSafe for Struct {
+        async fn f(&self) {}
+    }
+
+    let object = &Struct as &dyn ObjectSafe;
+    object.f().await;
+}
+
+pub async fn test_object_safe_with_default() {
+    #[async_trait]
+    trait ObjectSafe: Sync {
+        async fn f(&self) {}
+    }
+
+    #[async_trait]
+    impl ObjectSafe for Struct {
+        async fn f(&self) {}
+    }
+
+    let object = &Struct as &dyn ObjectSafe;
+    object.f().await;
+}
+
+pub async fn test_object_no_send() {
+    #[async_trait(?Send)]
+    trait ObjectSafe: Sync {
+        async fn f(&self) {}
+    }
+
+    #[async_trait(?Send)]
+    impl ObjectSafe for Struct {
+        async fn f(&self) {}
+    }
+
+    let object = &Struct as &dyn ObjectSafe;
+    object.f().await;
+}
+
+#[async_trait]
+pub unsafe trait UnsafeTrait {}
+
+#[async_trait]
+unsafe impl UnsafeTrait for () {}
+
+#[async_trait]
+pub(crate) unsafe trait UnsafeTraitPubCrate {}
+
+#[async_trait]
+unsafe trait UnsafeTraitPrivate {}
+
+pub async fn test_can_destruct() {
+    #[async_trait]
+    trait CanDestruct {
+        async fn f(&self, foos: (u8, u8, u8, u8));
+    }
+
+    #[async_trait]
+    impl CanDestruct for Struct {
+        async fn f(&self, (a, ref mut b, ref c, d): (u8, u8, u8, u8)) {
+            let _a: u8 = a;
+            let _b: &mut u8 = b;
+            let _c: &u8 = c;
+            let _d: u8 = d;
+        }
+    }
+}
+
+pub async fn test_self_in_macro() {
+    #[async_trait]
+    trait Trait {
+        async fn a(self);
+        async fn b(&mut self);
+        async fn c(&self);
+    }
+
+    #[async_trait]
+    impl Trait for String {
+        async fn a(self) {
+            println!("{}", self);
+        }
+        async fn b(&mut self) {
+            println!("{}", self);
+        }
+        async fn c(&self) {
+            println!("{}", self);
+        }
+    }
+}
+
+pub async fn test_inference() {
+    #[async_trait]
+    pub trait Trait {
+        async fn f() -> Box<dyn Iterator<Item = ()>> {
+            Box::new(std::iter::empty())
+        }
+    }
+}
+
+pub async fn test_internal_items() {
+    #[async_trait]
+    #[allow(dead_code, clippy::items_after_statements)]
+    pub trait Trait: Sized {
+        async fn f(self) {
+            struct Struct;
+
+            impl Struct {
+                fn f(self) {
+                    let _ = self;
+                }
+            }
+        }
+    }
+}
+
+pub async fn test_unimplemented() {
+    #[async_trait]
+    pub trait Trait {
+        async fn f() {
+            unimplemented!()
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/1
+pub mod issue1 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Issue1 {
+        async fn f<U>(&self);
+    }
+
+    #[async_trait]
+    impl<T: Sync> Issue1 for Vec<T> {
+        async fn f<U>(&self) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/2
+pub mod issue2 {
+    use async_trait::async_trait;
+    use std::future::Future;
+
+    #[async_trait]
+    pub trait Issue2: Future {
+        async fn flatten(self) -> <Self::Output as Future>::Output
+        where
+            Self::Output: Future + Send,
+            Self: Sized,
+        {
+            let nested_future = self.await;
+            nested_future.await
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/9
+pub mod issue9 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Issue9: Sized + Send {
+        async fn f(_x: Self) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/11
+pub mod issue11 {
+    use async_trait::async_trait;
+    use std::sync::Arc;
+
+    #[async_trait]
+    trait Issue11 {
+        async fn example(self: Arc<Self>);
+    }
+
+    struct Struct;
+
+    #[async_trait]
+    impl Issue11 for Struct {
+        async fn example(self: Arc<Self>) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/15
+pub mod issue15 {
+    use async_trait::async_trait;
+    use std::marker::PhantomData;
+
+    trait Trait {}
+
+    #[async_trait]
+    trait Issue15 {
+        async fn myfn(&self, _: PhantomData<dyn Trait + Send>) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/17
+pub mod issue17 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Issue17 {
+        async fn f(&self);
+    }
+
+    struct Struct {
+        string: String,
+    }
+
+    #[async_trait]
+    impl Issue17 for Struct {
+        async fn f(&self) {
+            println!("{}", self.string);
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/23
+pub mod issue23 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Issue23 {
+        async fn f(self);
+
+        async fn g(mut self)
+        where
+            Self: Sized,
+        {
+            do_something(&mut self);
+        }
+    }
+
+    struct S {}
+
+    #[async_trait]
+    impl Issue23 for S {
+        async fn f(mut self) {
+            do_something(&mut self);
+        }
+    }
+
+    fn do_something<T>(_: &mut T) {}
+}
+
+// https://github.com/dtolnay/async-trait/issues/25
+#[cfg(async_trait_nightly_testing)]
+pub mod issue25 {
+    use crate::executor;
+    use async_trait::async_trait;
+    use std::fmt::{Display, Write};
+
+    #[async_trait]
+    trait AsyncToString {
+        async fn async_to_string(&self) -> String;
+    }
+
+    #[async_trait]
+    impl AsyncToString for String {
+        async fn async_to_string(&self) -> String {
+            "special".to_owned()
+        }
+    }
+
+    macro_rules! hide_from_stable_parser {
+        ($($tt:tt)*) => {
+            $($tt)*
+        };
+    }
+
+    hide_from_stable_parser! {
+        #[async_trait]
+        impl<T: ?Sized + Display + Sync> AsyncToString for T {
+            default async fn async_to_string(&self) -> String {
+                let mut buf = String::new();
+                buf.write_fmt(format_args!("{}", self)).unwrap();
+                buf
+            }
+        }
+    }
+
+    #[test]
+    fn test() {
+        let fut = true.async_to_string();
+        assert_eq!(executor::block_on_simple(fut), "true");
+
+        let string = String::new();
+        let fut = string.async_to_string();
+        assert_eq!(executor::block_on_simple(fut), "special");
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/28
+pub mod issue28 {
+    use async_trait::async_trait;
+
+    struct Str<'a>(&'a str);
+
+    #[async_trait]
+    trait Trait1<'a> {
+        async fn f(x: Str<'a>) -> &'a str;
+        async fn g(x: Str<'a>) -> &'a str {
+            x.0
+        }
+    }
+
+    #[async_trait]
+    impl<'a> Trait1<'a> for str {
+        async fn f(x: Str<'a>) -> &'a str {
+            x.0
+        }
+    }
+
+    #[async_trait]
+    trait Trait2 {
+        async fn f();
+    }
+
+    #[async_trait]
+    impl<'a> Trait2 for &'a () {
+        async fn f() {}
+    }
+
+    #[async_trait]
+    trait Trait3<'a, 'b> {
+        async fn f(_: &'a &'b ()); // chain 'a and 'b
+        async fn g(_: &'b ()); // chain 'b only
+        async fn h(); // do not chain
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/31
+pub mod issue31 {
+    use async_trait::async_trait;
+
+    pub struct Struct<'a> {
+        pub name: &'a str,
+    }
+
+    #[async_trait]
+    pub trait Trait<'a> {
+        async fn hello(thing: Struct<'a>) -> String;
+        async fn hello_twice(one: Struct<'a>, two: Struct<'a>) -> String {
+            let str1 = Self::hello(one).await;
+            let str2 = Self::hello(two).await;
+            str1 + &str2
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/42
+pub mod issue42 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Context: Sized {
+        async fn from_parts() -> Self;
+    }
+
+    pub struct TokenContext;
+
+    #[async_trait]
+    impl Context for TokenContext {
+        async fn from_parts() -> TokenContext {
+            TokenContext
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/44
+pub mod issue44 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait StaticWithWhereSelf
+    where
+        Box<Self>: Sized,
+        Self: Sized + Send,
+    {
+        async fn get_one() -> u8 {
+            1
+        }
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl StaticWithWhereSelf for Struct {}
+}
+
+// https://github.com/dtolnay/async-trait/issues/45
+pub mod issue45 {
+    use crate::executor;
+    use async_trait::async_trait;
+    use std::fmt::Debug;
+    use std::sync::atomic::{AtomicU64, Ordering};
+    use std::sync::{Arc, Mutex};
+    use tracing::event::Event;
+    use tracing::field::{Field, Visit};
+    use tracing::span::{Attributes, Id, Record};
+    use tracing::{info, instrument, subscriber, Metadata, Subscriber};
+
+    #[async_trait]
+    pub trait Parent {
+        async fn foo(&mut self, v: usize);
+    }
+
+    #[async_trait]
+    pub trait Child {
+        async fn bar(&self);
+    }
+
+    #[derive(Debug)]
+    struct Impl(usize);
+
+    #[async_trait]
+    impl Parent for Impl {
+        #[instrument]
+        async fn foo(&mut self, v: usize) {
+            self.0 = v;
+            self.bar().await;
+        }
+    }
+
+    #[async_trait]
+    impl Child for Impl {
+        // Let's check that tracing detects the renaming of the `self` variable
+        // too, as tracing::instrument is not going to be able to skip the
+        // `self` argument if it can't find it in the function signature.
+        #[instrument(skip(self))]
+        async fn bar(&self) {
+            info!(val = self.0);
+        }
+    }
+
+    // A simple subscriber implementation to test the behavior of async-trait
+    // with tokio-rs/tracing. This implementation is not robust against race
+    // conditions, but it's not an issue here as we are only polling on a single
+    // future at a time.
+    #[derive(Debug)]
+    struct SubscriberInner {
+        current_depth: AtomicU64,
+        // We assert that nested functions work. If the fix were to break, we
+        // would see two top-level functions instead of `bar` nested in `foo`.
+        max_depth: AtomicU64,
+        max_span_id: AtomicU64,
+        // Name of the variable / value / depth when the event was recorded.
+        value: Mutex<Option<(&'static str, u64, u64)>>,
+    }
+
+    #[derive(Debug, Clone)]
+    struct TestSubscriber {
+        inner: Arc<SubscriberInner>,
+    }
+
+    impl TestSubscriber {
+        fn new() -> Self {
+            TestSubscriber {
+                inner: Arc::new(SubscriberInner {
+                    current_depth: AtomicU64::new(0),
+                    max_depth: AtomicU64::new(0),
+                    max_span_id: AtomicU64::new(1),
+                    value: Mutex::new(None),
+                }),
+            }
+        }
+    }
+
+    struct U64Visitor(Option<(&'static str, u64)>);
+
+    impl Visit for U64Visitor {
+        fn record_debug(&mut self, _field: &Field, _value: &dyn Debug) {}
+
+        fn record_u64(&mut self, field: &Field, value: u64) {
+            self.0 = Some((field.name(), value));
+        }
+    }
+
+    impl Subscriber for TestSubscriber {
+        fn enabled(&self, _metadata: &Metadata) -> bool {
+            true
+        }
+        fn new_span(&self, _span: &Attributes) -> Id {
+            Id::from_u64(self.inner.max_span_id.fetch_add(1, Ordering::AcqRel))
+        }
+        fn record(&self, _span: &Id, _values: &Record) {}
+        fn record_follows_from(&self, _span: &Id, _follows: &Id) {}
+        fn event(&self, event: &Event) {
+            let mut visitor = U64Visitor(None);
+            event.record(&mut visitor);
+            if let Some((s, v)) = visitor.0 {
+                let current_depth = self.inner.current_depth.load(Ordering::Acquire);
+                *self.inner.value.lock().unwrap() = Some((s, v, current_depth));
+            }
+        }
+        fn enter(&self, _span: &Id) {
+            let old_depth = self.inner.current_depth.fetch_add(1, Ordering::AcqRel);
+            if old_depth + 1 > self.inner.max_depth.load(Ordering::Acquire) {
+                self.inner.max_depth.fetch_add(1, Ordering::AcqRel);
+            }
+        }
+        fn exit(&self, _span: &Id) {
+            self.inner.current_depth.fetch_sub(1, Ordering::AcqRel);
+        }
+    }
+
+    #[test]
+    #[cfg_attr(miri, ignore)] // https://github.com/matklad/once_cell/pull/185
+    fn tracing() {
+        // Create the future outside of the subscriber, as no call to tracing
+        // should be made until the future is polled.
+        let mut struct_impl = Impl(0);
+        let fut = struct_impl.foo(5);
+        let subscriber = TestSubscriber::new();
+        subscriber::with_default(subscriber.clone(), || executor::block_on_simple(fut));
+        // Did we enter bar inside of foo?
+        assert_eq!(subscriber.inner.max_depth.load(Ordering::Acquire), 2);
+        // Have we exited all spans?
+        assert_eq!(subscriber.inner.current_depth.load(Ordering::Acquire), 0);
+        // Did we create only two spans? Note: spans start at 1, hence the -1.
+        assert_eq!(subscriber.inner.max_span_id.load(Ordering::Acquire) - 1, 2);
+        // Was the value recorded at the right depth i.e. in the right function?
+        // If so, was it the expected value?
+        assert_eq!(*subscriber.inner.value.lock().unwrap(), Some(("val", 5, 2)));
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/46
+pub mod issue46 {
+    use async_trait::async_trait;
+
+    macro_rules! implement_commands_workaround {
+        ($tyargs:tt : $ty:tt) => {
+            #[async_trait]
+            pub trait AsyncCommands1: Sized {
+                async fn f<$tyargs: $ty>(&mut self, x: $tyargs) {
+                    self.f(x).await
+                }
+            }
+        };
+    }
+
+    implement_commands_workaround!(K: Send);
+
+    macro_rules! implement_commands {
+        ($tyargs:ident : $ty:ident) => {
+            #[async_trait]
+            pub trait AsyncCommands2: Sized {
+                async fn f<$tyargs: $ty>(&mut self, x: $tyargs) {
+                    self.f(x).await
+                }
+            }
+        };
+    }
+
+    implement_commands!(K: Send);
+}
+
+// https://github.com/dtolnay/async-trait/issues/53
+pub mod issue53 {
+    use async_trait::async_trait;
+
+    pub struct Unit;
+    pub struct Tuple(u8);
+    pub struct Struct {
+        pub x: u8,
+    }
+
+    #[async_trait]
+    pub trait Trait {
+        async fn method();
+    }
+
+    #[async_trait]
+    impl Trait for Unit {
+        async fn method() {
+            let _ = Self;
+        }
+    }
+
+    #[async_trait]
+    impl Trait for Tuple {
+        async fn method() {
+            let _ = Self(0);
+        }
+    }
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn method() {
+            let _ = Self { x: 0 };
+        }
+    }
+
+    #[async_trait]
+    impl Trait for std::marker::PhantomData<Struct> {
+        async fn method() {
+            let _ = Self;
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/57
+#[cfg(async_trait_nightly_testing)]
+pub mod issue57 {
+    use crate::executor;
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Trait {
+        async fn const_generic<T: Send, const C: usize>(_: [T; C]) {}
+    }
+
+    struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn const_generic<T: Send, const C: usize>(_: [T; C]) {}
+    }
+
+    #[test]
+    fn test() {
+        let fut = Struct::const_generic([0; 10]);
+        executor::block_on_simple(fut);
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/68
+pub mod issue68 {
+    #[rustversion::since(1.40)] // procedural macros cannot expand to macro definitions in 1.39.
+    #[async_trait::async_trait]
+    pub trait Example {
+        async fn method(&self) {
+            macro_rules! t {
+                () => {{
+                    let _: &Self = self;
+                }};
+            }
+            t!();
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/73
+pub mod issue73 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Example {
+        const ASSOCIATED: &'static str;
+
+        async fn associated(&self) {
+            println!("Associated:{}", Self::ASSOCIATED);
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/81
+pub mod issue81 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn handle(&self);
+    }
+
+    pub enum Enum {
+        Variant,
+    }
+
+    #[async_trait]
+    impl Trait for Enum {
+        async fn handle(&self) {
+            let Enum::Variant = self;
+            let Self::Variant = self;
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/83
+pub mod issue83 {
+    #![allow(clippy::needless_arbitrary_self_type)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(&self) {}
+        async fn g(self: &Self) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/85
+pub mod issue85 {
+    #![deny(non_snake_case)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        #[allow(non_snake_case)]
+        async fn camelCase();
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn camelCase() {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/87
+pub mod issue87 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(&self);
+    }
+
+    pub enum Tuple {
+        V(),
+    }
+
+    pub enum Struct {
+        V {},
+    }
+
+    #[async_trait]
+    impl Trait for Tuple {
+        async fn f(&self) {
+            let Tuple::V() = self;
+            let Self::V() = self;
+            let _ = Self::V;
+            let _ = Self::V();
+        }
+    }
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn f(&self) {
+            let Struct::V {} = self;
+            let Self::V {} = self;
+            let _ = Self::V {};
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/89
+pub mod issue89 {
+    #![allow(bare_trait_objects)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Trait {
+        async fn f(&self);
+    }
+
+    #[async_trait]
+    impl Trait for Send + Sync {
+        async fn f(&self) {}
+    }
+
+    #[async_trait]
+    impl Trait for dyn Fn(i8) + Send + Sync {
+        async fn f(&self) {}
+    }
+
+    #[async_trait]
+    impl Trait for (dyn Fn(u8) + Send + Sync) {
+        async fn f(&self) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/92
+pub mod issue92 {
+    use async_trait::async_trait;
+
+    macro_rules! mac {
+        ($($tt:tt)*) => {
+            $($tt)*
+        };
+    }
+
+    pub struct Struct<T> {
+        _x: T,
+    }
+
+    impl<T> Struct<T> {
+        const ASSOCIATED1: &'static str = "1";
+        async fn associated1() {}
+    }
+
+    #[async_trait]
+    pub trait Trait
+    where
+        mac!(Self): Send,
+    {
+        const ASSOCIATED2: &'static str;
+        type Associated2;
+
+        #[allow(path_statements, clippy::let_underscore_future, clippy::no_effect)]
+        async fn associated2(&self) {
+            // trait items
+            mac!(let _: Self::Associated2;);
+            mac!(let _: <Self>::Associated2;);
+            mac!(let _: <Self as Trait>::Associated2;);
+            mac!(Self::ASSOCIATED2;);
+            mac!(<Self>::ASSOCIATED2;);
+            mac!(<Self as Trait>::ASSOCIATED2;);
+            mac!(let _ = Self::associated2(self););
+            mac!(let _ = <Self>::associated2(self););
+            mac!(let _ = <Self as Trait>::associated2(self););
+        }
+    }
+
+    #[async_trait]
+    impl<T: Send + Sync> Trait for Struct<T>
+    where
+        mac!(Self): Send,
+    {
+        const ASSOCIATED2: &'static str = "2";
+        type Associated2 = ();
+
+        #[allow(path_statements, clippy::let_underscore_future, clippy::no_effect)]
+        async fn associated2(&self) {
+            // inherent items
+            mac!(Self::ASSOCIATED1;);
+            mac!(<Self>::ASSOCIATED1;);
+            mac!(let _ = Self::associated1(););
+            mac!(let _ = <Self>::associated1(););
+
+            // trait items
+            mac!(let _: <Self as Trait>::Associated2;);
+            mac!(Self::ASSOCIATED2;);
+            mac!(<Self>::ASSOCIATED2;);
+            mac!(<Self as Trait>::ASSOCIATED2;);
+            mac!(let _ = Self::associated2(self););
+            mac!(let _ = <Self>::associated2(self););
+            mac!(let _ = <Self as Trait>::associated2(self););
+        }
+    }
+
+    pub struct Unit;
+
+    #[async_trait]
+    impl Trait for Unit {
+        const ASSOCIATED2: &'static str = "2";
+        type Associated2 = ();
+
+        async fn associated2(&self) {
+            mac!(let Self: Self = *self;);
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/92#issuecomment-683370136
+pub mod issue92_2 {
+    use async_trait::async_trait;
+
+    macro_rules! mac {
+        ($($tt:tt)*) => {
+            $($tt)*
+        };
+    }
+
+    pub trait Trait1 {
+        fn func1();
+    }
+
+    #[async_trait]
+    pub trait Trait2: Trait1 {
+        async fn func2() {
+            mac!(Self::func1());
+
+            macro_rules! mac2 {
+                ($($tt:tt)*) => {
+                    Self::func1();
+                };
+            }
+            mac2!();
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/104
+pub mod issue104 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait T1 {
+        async fn id(&self) -> i32;
+    }
+
+    macro_rules! impl_t1 {
+        ($ty:ty, $id:expr) => {
+            #[async_trait]
+            impl T1 for $ty {
+                async fn id(&self) -> i32 {
+                    $id
+                }
+            }
+        };
+    }
+
+    struct Foo;
+
+    impl_t1!(Foo, 1);
+}
+
+// https://github.com/dtolnay/async-trait/issues/106
+pub mod issue106 {
+    use async_trait::async_trait;
+    use std::future::Future;
+
+    #[async_trait]
+    pub trait ProcessPool: Send + Sync {
+        type ThreadPool;
+
+        async fn spawn<F, Fut, T>(&self, work: F) -> T
+        where
+            F: FnOnce(&Self::ThreadPool) -> Fut + Send,
+            Fut: Future<Output = T> + 'static;
+    }
+
+    #[async_trait]
+    impl<P> ProcessPool for &P
+    where
+        P: ?Sized + ProcessPool,
+    {
+        type ThreadPool = P::ThreadPool;
+
+        async fn spawn<F, Fut, T>(&self, work: F) -> T
+        where
+            F: FnOnce(&Self::ThreadPool) -> Fut + Send,
+            Fut: Future<Output = T> + 'static,
+        {
+            (**self).spawn(work).await
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/110
+pub mod issue110 {
+    use async_trait::async_trait;
+    use std::marker::PhantomData;
+
+    #[async_trait]
+    pub trait Loader {
+        async fn load(&self, key: &str);
+    }
+
+    pub struct AwsEc2MetadataLoader<'a> {
+        marker: PhantomData<&'a ()>,
+    }
+
+    #[async_trait]
+    impl Loader for AwsEc2MetadataLoader<'_> {
+        async fn load(&self, _key: &str) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/120
+pub mod issue120 {
+    #![deny(clippy::trivially_copy_pass_by_ref)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Trait {
+        async fn f(&self);
+    }
+
+    #[async_trait]
+    impl Trait for () {
+        async fn f(&self) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/123
+pub mod issue123 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Trait<T = ()> {
+        async fn f(&self) -> &str
+        where
+            T: 'async_trait,
+        {
+            "default"
+        }
+    }
+
+    #[async_trait]
+    impl<T> Trait<T> for () {}
+}
+
+// https://github.com/dtolnay/async-trait/issues/129
+pub mod issue129 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait TestTrait {
+        async fn a(_b: u8, c: u8) -> u8 {
+            c
+        }
+    }
+
+    pub struct TestStruct;
+
+    #[async_trait]
+    impl TestTrait for TestStruct {
+        async fn a(_b: u8, c: u8) -> u8 {
+            c
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/134
+#[cfg(async_trait_nightly_testing)]
+pub mod issue134 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait TestTrait {
+        async fn run<const DUMMY: bool>(self)
+        where
+            Self: Sized,
+        {
+        }
+    }
+
+    pub struct TestStruct;
+
+    #[async_trait]
+    impl TestTrait for TestStruct {
+        async fn run<const DUMMY: bool>(self)
+        where
+            Self: Sized,
+        {
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/pull/125#pullrequestreview-491880881
+pub mod drop_order {
+    use crate::executor;
+    use async_trait::async_trait;
+    use std::sync::atomic::{AtomicBool, Ordering};
+
+    struct Flagger<'a>(&'a AtomicBool);
+
+    impl Drop for Flagger<'_> {
+        fn drop(&mut self) {
+            self.0.fetch_xor(true, Ordering::AcqRel);
+        }
+    }
+
+    #[async_trait]
+    trait Trait {
+        async fn async_trait(_: Flagger<'_>, flag: &AtomicBool);
+    }
+
+    struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn async_trait(_: Flagger<'_>, flag: &AtomicBool) {
+            flag.fetch_or(true, Ordering::AcqRel);
+        }
+    }
+
+    async fn standalone(_: Flagger<'_>, flag: &AtomicBool) {
+        flag.fetch_or(true, Ordering::AcqRel);
+    }
+
+    #[async_trait]
+    trait SelfTrait {
+        async fn async_trait(self, flag: &AtomicBool);
+    }
+
+    #[async_trait]
+    impl SelfTrait for Flagger<'_> {
+        async fn async_trait(self, flag: &AtomicBool) {
+            flag.fetch_or(true, Ordering::AcqRel);
+        }
+    }
+
+    #[test]
+    fn test_drop_order() {
+        // 0 : 0 ^ 1 = 1 | 1 = 1 (if flagger then block)
+        // 0 : 0 | 1 = 1 ^ 1 = 0 (if block then flagger)
+
+        let flag = AtomicBool::new(false);
+        executor::block_on_simple(standalone(Flagger(&flag), &flag));
+        assert!(!flag.load(Ordering::Acquire));
+
+        executor::block_on_simple(Struct::async_trait(Flagger(&flag), &flag));
+        assert!(!flag.load(Ordering::Acquire));
+
+        executor::block_on_simple(Flagger(&flag).async_trait(&flag));
+        assert!(!flag.load(Ordering::Acquire));
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/145
+pub mod issue145 {
+    #![deny(clippy::type_complexity)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait ManageConnection: Sized + Send + Sync + 'static {
+        type Connection: Send + 'static;
+        type Error: Send + 'static;
+
+        async fn connect(&self) -> Result<Self::Connection, Self::Error>;
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/147
+pub mod issue147 {
+    #![deny(clippy::let_unit_value)]
+
+    use async_trait::async_trait;
+
+    pub struct MyType;
+
+    #[async_trait]
+    pub trait MyTrait {
+        async fn x();
+        async fn y() -> ();
+        async fn z();
+    }
+
+    #[async_trait]
+    impl MyTrait for MyType {
+        async fn x() {}
+        async fn y() -> () {}
+        async fn z() {
+            unimplemented!()
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/149
+pub mod issue149 {
+    use async_trait::async_trait;
+
+    pub struct Thing;
+    pub trait Ret {}
+    impl Ret for Thing {}
+
+    pub async fn ok() -> &'static dyn Ret {
+        return &Thing;
+    }
+
+    #[async_trait]
+    pub trait Trait {
+        async fn fail() -> &'static dyn Ret {
+            return &Thing;
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/152
+#[cfg(async_trait_nightly_testing)]
+pub mod issue152 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Trait {
+        type Assoc;
+
+        async fn f(&self) -> Self::Assoc;
+    }
+
+    struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        type Assoc = impl Sized;
+
+        async fn f(&self) -> Self::Assoc {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/154
+pub mod issue154 {
+    #![deny(clippy::items_after_statements)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait MyTrait {
+        async fn f(&self);
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl MyTrait for Struct {
+        async fn f(&self) {
+            const MAX: u16 = 128;
+            println!("{}", MAX);
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/158
+pub mod issue158 {
+    use async_trait::async_trait;
+
+    fn f() {}
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(&self) {
+            self::f();
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/161
+#[allow(clippy::mut_mut)]
+pub mod issue161 {
+    use async_trait::async_trait;
+    use futures::future::FutureExt;
+    use std::sync::Arc;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(self: Arc<Self>);
+    }
+
+    pub struct MyStruct(bool);
+
+    #[async_trait]
+    impl Trait for MyStruct {
+        async fn f(self: Arc<Self>) {
+            futures::select! {
+                _ = async {
+                    println!("{}", self.0);
+                }.fuse() => {}
+            }
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/169
+#[deny(where_clauses_object_safety)]
+pub mod issue169 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait: ::core::marker::Sync {
+        async fn f(&self) {}
+    }
+
+    pub fn test(_t: &dyn Trait) {}
+}
+
+// https://github.com/dtolnay/async-trait/issues/177
+pub mod issue177 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn foo(&self, _callback: impl FnMut(&str) + Send) {}
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn foo(&self, _callback: impl FnMut(&str) + Send) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/183
+pub mod issue183 {
+    #![deny(clippy::shadow_same)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    trait Foo {
+        async fn foo(_n: i32) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/199
+pub mod issue199 {
+    use async_trait::async_trait;
+    use std::cell::Cell;
+
+    struct IncrementOnDrop<'a>(&'a Cell<usize>);
+
+    impl<'a> Drop for IncrementOnDrop<'a> {
+        fn drop(&mut self) {
+            self.0.set(self.0.get() + 1);
+        }
+    }
+
+    #[async_trait(?Send)]
+    trait Trait {
+        async fn f(counter: &Cell<usize>, arg: IncrementOnDrop<'_>);
+    }
+
+    struct Struct;
+
+    #[async_trait(?Send)]
+    impl Trait for Struct {
+        async fn f(counter: &Cell<usize>, _: IncrementOnDrop<'_>) {
+            assert_eq!(counter.get(), 0); // second arg not dropped yet
+        }
+    }
+
+    #[test]
+    fn test() {
+        let counter = Cell::new(0);
+        let future = Struct::f(&counter, IncrementOnDrop(&counter));
+        assert_eq!(counter.get(), 0);
+        drop(future);
+        assert_eq!(counter.get(), 1);
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/204
+pub mod issue204 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(arg: &impl Trait);
+        async fn g(arg: *const impl Trait);
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/210
+pub mod issue210 {
+    use async_trait::async_trait;
+    use std::sync::Arc;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(self: Arc<Self>) {}
+    }
+}
diff --git a/third_party/rust/async-trait/tests/ui/arg-implementation-detail.rs b/third_party/rust/async-trait/tests/ui/arg-implementation-detail.rs
new file mode 100644
index 0000000000..b83aa72fcf
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/arg-implementation-detail.rs
@@ -0,0 +1,22 @@
+use async_trait::async_trait;
+
+pub struct Struct;
+
+#[async_trait]
+pub trait Trait {
+    async fn f((_a, _b): (Struct, Struct)) {
+        // Expands to something like:
+        //
+        //    fn f(__arg0: (Struct, Struct)) -> … {
+        //        Box::pin(async move {
+        //            let (_a, _b) = __arg0;
+        //            …
+        //        })
+        //    }
+        //
+        // but user's code must not be allowed to name that temporary argument:
+        let _ = __arg0;
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/arg-implementation-detail.stderr b/third_party/rust/async-trait/tests/ui/arg-implementation-detail.stderr
new file mode 100644
index 0000000000..e742688888
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/arg-implementation-detail.stderr
@@ -0,0 +1,5 @@
+error[E0425]: cannot find value `__arg0` in this scope
+  --> tests/ui/arg-implementation-detail.rs:18:17
+   |
+18 |         let _ = __arg0;
+   |                 ^^^^^^ not found in this scope
diff --git a/third_party/rust/async-trait/tests/ui/bare-trait-object.rs b/third_party/rust/async-trait/tests/ui/bare-trait-object.rs
new file mode 100644
index 0000000000..afcd6b44c3
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/bare-trait-object.rs
@@ -0,0 +1,15 @@
+#![deny(bare_trait_objects)]
+
+use async_trait::async_trait;
+
+#[async_trait]
+trait Trait {
+    async fn f(&self);
+}
+
+#[async_trait]
+impl Trait for Send + Sync {
+    async fn f(&self) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/bare-trait-object.stderr b/third_party/rust/async-trait/tests/ui/bare-trait-object.stderr
new file mode 100644
index 0000000000..50b20484cb
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/bare-trait-object.stderr
@@ -0,0 +1,21 @@
+error: trait objects without an explicit `dyn` are deprecated
+  --> tests/ui/bare-trait-object.rs:11:16
+   |
+11 | impl Trait for Send + Sync {
+   |                ^^^^^^^^^^^
+   |
+   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+note: the lint level is defined here
+  --> tests/ui/bare-trait-object.rs:1:9
+   |
+1  | #![deny(bare_trait_objects)]
+   |         ^^^^^^^^^^^^^^^^^^
+help: use `dyn`
+   |
+11 | impl Trait for dyn Send + Sync {
+   |                +++
+help: alternatively use a blanket implementation to implement `Trait` for all types that also implement `Send + Sync`
+   |
+11 | impl<T: Send + Sync> Trait for T {
+   |     ++++++++++++++++           ~
diff --git a/third_party/rust/async-trait/tests/ui/consider-restricting.rs b/third_party/rust/async-trait/tests/ui/consider-restricting.rs
new file mode 100644
index 0000000000..e23c8b1539
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/consider-restricting.rs
@@ -0,0 +1,26 @@
+// https://github.com/rust-lang/rust/issues/93828
+
+use async_trait::async_trait;
+
+pub trait IntoUrl {}
+
+#[async_trait]
+pub trait ClientExt {
+    async fn publish<T: IntoUrl>(&self, url: T);
+}
+
+struct Client;
+
+#[async_trait]
+impl ClientExt for Client {
+    async fn publish<T: IntoUrl>(&self, url: T) {}
+}
+
+struct Client2;
+
+#[async_trait]
+impl ClientExt for Client2 {
+    async fn publish<T>(&self, url: T) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/consider-restricting.stderr b/third_party/rust/async-trait/tests/ui/consider-restricting.stderr
new file mode 100644
index 0000000000..62ff894ed5
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/consider-restricting.stderr
@@ -0,0 +1,33 @@
+error: future cannot be sent between threads safely
+  --> tests/ui/consider-restricting.rs:16:49
+   |
+16 |     async fn publish<T: IntoUrl>(&self, url: T) {}
+   |                                                 ^^ future created by async block is not `Send`
+   |
+note: captured value is not `Send`
+  --> tests/ui/consider-restricting.rs:16:41
+   |
+16 |     async fn publish<T: IntoUrl>(&self, url: T) {}
+   |                                         ^^^ has type `T` which is not `Send`
+   = note: required for the cast from `[async block@$DIR/tests/ui/consider-restricting.rs:16:49: 16:51]` to the object type `dyn Future<Output = ()> + Send`
+help: consider further restricting this bound
+   |
+16 |     async fn publish<T: IntoUrl + std::marker::Send>(&self, url: T) {}
+   |                                 +++++++++++++++++++
+
+error: future cannot be sent between threads safely
+  --> tests/ui/consider-restricting.rs:23:40
+   |
+23 |     async fn publish<T>(&self, url: T) {}
+   |                                        ^^ future created by async block is not `Send`
+   |
+note: captured value is not `Send`
+  --> tests/ui/consider-restricting.rs:23:32
+   |
+23 |     async fn publish<T>(&self, url: T) {}
+   |                                ^^^ has type `T` which is not `Send`
+   = note: required for the cast from `[async block@$DIR/tests/ui/consider-restricting.rs:23:40: 23:42]` to the object type `dyn Future<Output = ()> + Send`
+help: consider further restricting this bound
+   |
+23 |     async fn publish<T + std::marker::Send>(&self, url: T) {}
+   |                        +++++++++++++++++++
diff --git a/third_party/rust/async-trait/tests/ui/delimiter-span.rs b/third_party/rust/async-trait/tests/ui/delimiter-span.rs
new file mode 100644
index 0000000000..51a44a24b5
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/delimiter-span.rs
@@ -0,0 +1,24 @@
+#![allow(unused_macro_rules)]
+
+use async_trait::async_trait;
+
+macro_rules! picky {
+    ($(t:tt)*) => {};
+}
+
+#[async_trait]
+trait Trait {
+    async fn method();
+}
+
+struct Struct;
+
+#[async_trait]
+impl Trait for Struct {
+    async fn method() {
+        picky!({ 123, self });
+        picky!({ 123 });
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/delimiter-span.stderr b/third_party/rust/async-trait/tests/ui/delimiter-span.stderr
new file mode 100644
index 0000000000..f03da4c97c
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/delimiter-span.stderr
@@ -0,0 +1,21 @@
+error: no rules expected the token `{`
+  --> tests/ui/delimiter-span.rs:19:16
+   |
+5  | macro_rules! picky {
+   | ------------------ when calling this macro
+...
+19 |         picky!({ 123, self });
+   |                ^ no rules expected this token in macro call
+   |
+   = note: while trying to match sequence start
+
+error: no rules expected the token `{`
+  --> tests/ui/delimiter-span.rs:20:16
+   |
+5  | macro_rules! picky {
+   | ------------------ when calling this macro
+...
+20 |         picky!({ 123 });
+   |                ^ no rules expected this token in macro call
+   |
+   = note: while trying to match sequence start
diff --git a/third_party/rust/async-trait/tests/ui/lifetime-span.rs b/third_party/rust/async-trait/tests/ui/lifetime-span.rs
new file mode 100644
index 0000000000..01981e6de4
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/lifetime-span.rs
@@ -0,0 +1,36 @@
+use async_trait::async_trait;
+
+struct A;
+struct B;
+
+#[async_trait]
+pub trait Trait<'r> {
+    async fn method(&'r self);
+}
+
+#[async_trait]
+impl Trait for A {
+    async fn method(&self) {}
+}
+
+#[async_trait]
+impl<'r> Trait<'r> for B {
+    async fn method(&self) {}
+}
+
+#[async_trait]
+pub trait Trait2 {
+    async fn method<'r>(&'r self);
+}
+
+#[async_trait]
+impl Trait2 for A {
+    async fn method(&self) {}
+}
+
+#[async_trait]
+impl<'r> Trait2<'r> for B {
+    async fn method(&'r self) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/lifetime-span.stderr b/third_party/rust/async-trait/tests/ui/lifetime-span.stderr
new file mode 100644
index 0000000000..999da04c30
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/lifetime-span.stderr
@@ -0,0 +1,25 @@
+error[E0726]: implicit elided lifetime not allowed here
+  --> tests/ui/lifetime-span.rs:12:6
+   |
+12 | impl Trait for A {
+   |      ^^^^^ expected lifetime parameter
+   |
+   = note: assuming a `'static` lifetime...
+help: indicate the anonymous lifetime
+   |
+12 | impl Trait<'_> for A {
+   |           ++++
+
+error[E0107]: this trait takes 0 lifetime arguments but 1 lifetime argument was supplied
+  --> tests/ui/lifetime-span.rs:32:10
+   |
+32 | impl<'r> Trait2<'r> for B {
+   |          ^^^^^^---- help: remove these generics
+   |          |
+   |          expected 0 lifetime arguments
+   |
+note: trait defined here, with 0 lifetime parameters
+  --> tests/ui/lifetime-span.rs:22:11
+   |
+22 | pub trait Trait2 {
+   |           ^^^^^^
diff --git a/third_party/rust/async-trait/tests/ui/missing-async-in-impl.rs b/third_party/rust/async-trait/tests/ui/missing-async-in-impl.rs
new file mode 100644
index 0000000000..3a5f58c3ac
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-async-in-impl.rs
@@ -0,0 +1,15 @@
+use async_trait::async_trait;
+
+#[async_trait]
+pub trait Trait {
+    async fn method();
+}
+
+pub struct Struct;
+
+#[async_trait]
+impl Trait for Struct {
+    fn method() {}
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/missing-async-in-impl.stderr b/third_party/rust/async-trait/tests/ui/missing-async-in-impl.stderr
new file mode 100644
index 0000000000..e461c85d8d
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-async-in-impl.stderr
@@ -0,0 +1,8 @@
+error[E0195]: lifetime parameters or bounds on method `method` do not match the trait declaration
+  --> tests/ui/missing-async-in-impl.rs:12:14
+   |
+5  |     async fn method();
+   |              -------- lifetimes in impl do not match this method in trait
+...
+12 |     fn method() {}
+   |              ^ lifetimes do not match method in trait
diff --git a/third_party/rust/async-trait/tests/ui/missing-async-in-trait.rs b/third_party/rust/async-trait/tests/ui/missing-async-in-trait.rs
new file mode 100644
index 0000000000..56fea7a1f8
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-async-in-trait.rs
@@ -0,0 +1,15 @@
+use async_trait::async_trait;
+
+#[async_trait]
+pub trait Trait {
+    fn method();
+}
+
+pub struct Struct;
+
+#[async_trait]
+impl Trait for Struct {
+    async fn method() {}
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/missing-async-in-trait.stderr b/third_party/rust/async-trait/tests/ui/missing-async-in-trait.stderr
new file mode 100644
index 0000000000..c92c38da5e
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-async-in-trait.stderr
@@ -0,0 +1,8 @@
+error[E0195]: lifetime parameters or bounds on method `method` do not match the trait declaration
+  --> tests/ui/missing-async-in-trait.rs:12:14
+   |
+5  |     fn method();
+   |              - lifetimes in impl do not match this method in trait
+...
+12 |     async fn method() {}
+   |              ^^^^^^^^ lifetimes do not match method in trait
diff --git a/third_party/rust/async-trait/tests/ui/missing-body.rs b/third_party/rust/async-trait/tests/ui/missing-body.rs
new file mode 100644
index 0000000000..f3e1126d1d
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-body.rs
@@ -0,0 +1,15 @@
+use async_trait::async_trait;
+
+#[async_trait]
+trait Trait {
+    async fn f(&self);
+}
+
+struct Thing;
+
+#[async_trait]
+impl Trait for Thing {
+    async fn f(&self);
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/missing-body.stderr b/third_party/rust/async-trait/tests/ui/missing-body.stderr
new file mode 100644
index 0000000000..e6ddb425f9
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/missing-body.stderr
@@ -0,0 +1,7 @@
+error: associated function in `impl` without body
+  --> tests/ui/missing-body.rs:12:5
+   |
+12 |     async fn f(&self);
+   |     ^^^^^^^^^^^^^^^^^-
+   |                      |
+   |                      help: provide a definition for the function: `{ <body> }`
diff --git a/third_party/rust/async-trait/tests/ui/must-use.rs b/third_party/rust/async-trait/tests/ui/must-use.rs
new file mode 100644
index 0000000000..7ad0d9bf33
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/must-use.rs
@@ -0,0 +1,21 @@
+#![deny(unused_must_use)]
+
+use async_trait::async_trait;
+
+#[async_trait]
+trait Interface {
+    async fn f(&self);
+}
+
+struct Thing;
+
+#[async_trait]
+impl Interface for Thing {
+    async fn f(&self) {}
+}
+
+pub async fn f() {
+    Thing.f();
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/must-use.stderr b/third_party/rust/async-trait/tests/ui/must-use.stderr
new file mode 100644
index 0000000000..fd6fc31d60
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/must-use.stderr
@@ -0,0 +1,11 @@
+error: unused return value of `Interface::f` that must be used
+  --> tests/ui/must-use.rs:18:5
+   |
+18 |     Thing.f();
+   |     ^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> tests/ui/must-use.rs:1:9
+   |
+1  | #![deny(unused_must_use)]
+   |         ^^^^^^^^^^^^^^^
diff --git a/third_party/rust/async-trait/tests/ui/self-span.rs b/third_party/rust/async-trait/tests/ui/self-span.rs
new file mode 100644
index 0000000000..b01f247032
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/self-span.rs
@@ -0,0 +1,30 @@
+use async_trait::async_trait;
+
+pub struct S {}
+
+pub enum E {
+    V {},
+}
+
+#[async_trait]
+pub trait Trait {
+    async fn method(self);
+}
+
+#[async_trait]
+impl Trait for S {
+    async fn method(self) {
+        let _: () = self;
+        let _: Self = Self;
+    }
+}
+
+#[async_trait]
+impl Trait for E {
+    async fn method(self) {
+        let _: () = self;
+        let _: Self = Self::V;
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/self-span.stderr b/third_party/rust/async-trait/tests/ui/self-span.stderr
new file mode 100644
index 0000000000..8743e57934
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/self-span.stderr
@@ -0,0 +1,27 @@
+error[E0308]: mismatched types
+  --> tests/ui/self-span.rs:17:21
+   |
+17 |         let _: () = self;
+   |                --   ^^^^ expected `()`, found struct `S`
+   |                |
+   |                expected due to this
+
+error: the `Self` constructor can only be used with tuple or unit structs
+  --> tests/ui/self-span.rs:18:23
+   |
+18 |         let _: Self = Self;
+   |                       ^^^^ help: use curly brackets: `Self { /* fields */ }`
+
+error[E0308]: mismatched types
+  --> tests/ui/self-span.rs:25:21
+   |
+25 |         let _: () = self;
+   |                --   ^^^^ expected `()`, found enum `E`
+   |                |
+   |                expected due to this
+
+error[E0533]: expected value, found struct variant `Self::V`
+  --> tests/ui/self-span.rs:26:23
+   |
+26 |         let _: Self = Self::V;
+   |                       ^^^^^^^ not a value
diff --git a/third_party/rust/async-trait/tests/ui/send-not-implemented.rs b/third_party/rust/async-trait/tests/ui/send-not-implemented.rs
new file mode 100644
index 0000000000..d8883fb498
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/send-not-implemented.rs
@@ -0,0 +1,22 @@
+use async_trait::async_trait;
+use std::sync::Mutex;
+
+async fn f() {}
+
+#[async_trait]
+trait Test {
+    async fn test(&self) {
+        let mutex = Mutex::new(());
+        let _guard = mutex.lock().unwrap();
+        f().await;
+    }
+
+    async fn test_ret(&self) -> bool {
+        let mutex = Mutex::new(());
+        let _guard = mutex.lock().unwrap();
+        f().await;
+        true
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/send-not-implemented.stderr b/third_party/rust/async-trait/tests/ui/send-not-implemented.stderr
new file mode 100644
index 0000000000..d68fc43c36
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/send-not-implemented.stderr
@@ -0,0 +1,47 @@
+error: future cannot be sent between threads safely
+  --> tests/ui/send-not-implemented.rs:8:26
+   |
+8  |       async fn test(&self) {
+   |  __________________________^
+9  | |         let mutex = Mutex::new(());
+10 | |         let _guard = mutex.lock().unwrap();
+11 | |         f().await;
+12 | |     }
+   | |_____^ future created by async block is not `Send`
+   |
+   = help: within `[async block@$DIR/tests/ui/send-not-implemented.rs:8:26: 12:6]`, the trait `Send` is not implemented for `MutexGuard<'_, ()>`
+note: future is not `Send` as this value is used across an await
+  --> tests/ui/send-not-implemented.rs:11:12
+   |
+10 |         let _guard = mutex.lock().unwrap();
+   |             ------ has type `MutexGuard<'_, ()>` which is not `Send`
+11 |         f().await;
+   |            ^^^^^^ await occurs here, with `_guard` maybe used later
+12 |     }
+   |     - `_guard` is later dropped here
+   = note: required for the cast from `[async block@$DIR/tests/ui/send-not-implemented.rs:8:26: 12:6]` to the object type `dyn Future<Output = ()> + Send`
+
+error: future cannot be sent between threads safely
+  --> tests/ui/send-not-implemented.rs:14:38
+   |
+14 |       async fn test_ret(&self) -> bool {
+   |  ______________________________________^
+15 | |         let mutex = Mutex::new(());
+16 | |         let _guard = mutex.lock().unwrap();
+17 | |         f().await;
+18 | |         true
+19 | |     }
+   | |_____^ future created by async block is not `Send`
+   |
+   = help: within `[async block@$DIR/tests/ui/send-not-implemented.rs:14:38: 19:6]`, the trait `Send` is not implemented for `MutexGuard<'_, ()>`
+note: future is not `Send` as this value is used across an await
+  --> tests/ui/send-not-implemented.rs:17:12
+   |
+16 |         let _guard = mutex.lock().unwrap();
+   |             ------ has type `MutexGuard<'_, ()>` which is not `Send`
+17 |         f().await;
+   |            ^^^^^^ await occurs here, with `_guard` maybe used later
+18 |         true
+19 |     }
+   |     - `_guard` is later dropped here
+   = note: required for the cast from `[async block@$DIR/tests/ui/send-not-implemented.rs:14:38: 19:6]` to the object type `dyn Future<Output = bool> + Send`
diff --git a/third_party/rust/async-trait/tests/ui/unreachable.rs b/third_party/rust/async-trait/tests/ui/unreachable.rs
new file mode 100644
index 0000000000..cac2826444
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/unreachable.rs
@@ -0,0 +1,20 @@
+#![deny(warnings)]
+
+use async_trait::async_trait;
+
+#[async_trait]
+pub trait Trait {
+    async fn f() {
+        unimplemented!()
+    }
+}
+
+#[async_trait]
+pub trait TraitFoo {
+    async fn f() {
+        let _y = unimplemented!();
+        let _z = _y;
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/unreachable.stderr b/third_party/rust/async-trait/tests/ui/unreachable.stderr
new file mode 100644
index 0000000000..08595e5af7
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/unreachable.stderr
@@ -0,0 +1,14 @@
+error: unreachable statement
+  --> tests/ui/unreachable.rs:16:9
+   |
+15 |         let _y = unimplemented!();
+   |                  ---------------- any code following this expression is unreachable
+16 |         let _z = _y;
+   |         ^^^^^^^^^^^^ unreachable statement
+   |
+note: the lint level is defined here
+  --> tests/ui/unreachable.rs:1:9
+   |
+1  | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(unreachable_code)]` implied by `#[deny(warnings)]`
diff --git a/third_party/rust/async-trait/tests/ui/unsupported-self.rs b/third_party/rust/async-trait/tests/ui/unsupported-self.rs
new file mode 100644
index 0000000000..5868c614ad
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/unsupported-self.rs
@@ -0,0 +1,15 @@
+use async_trait::async_trait;
+
+#[async_trait]
+pub trait Trait {
+    async fn method();
+}
+
+#[async_trait]
+impl Trait for &'static str {
+    async fn method() {
+        let _ = Self;
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/async-trait/tests/ui/unsupported-self.stderr b/third_party/rust/async-trait/tests/ui/unsupported-self.stderr
new file mode 100644
index 0000000000..14939459e1
--- /dev/null
+++ b/third_party/rust/async-trait/tests/ui/unsupported-self.stderr
@@ -0,0 +1,5 @@
+error: the `Self` constructor can only be used with tuple or unit structs
+  --> tests/ui/unsupported-self.rs:11:17
+   |
+11 |         let _ = Self;
+   |                 ^^^^