Rollup merge of rust-lang#62608 - delan:async-unsafe-fn-tests, r=Centril

`async unsafe fn` tests

- cc rust-lang#62121

r? @Centril

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

@@ -70,6 +70,8 @@ fn async_nonmove_block(x: u8) -> impl Future<Output = u8> {
     }
 }
 
+// see async-closure.rs for async_closure + async_closure_in_unsafe_block
+
 async fn async_fn(x: u8) -> u8 {
     wake_and_yield_once().await;
     x
@@ -120,6 +122,18 @@ async unsafe fn unsafe_async_fn(x: u8) -> u8 {
     x
 }
 
+unsafe fn unsafe_fn(x: u8) -> u8 {
+    x
+}
+
+fn async_block_in_unsafe_block(x: u8) -> impl Future<Output = u8> {
+    unsafe {
+        async move {
+            unsafe_fn(unsafe_async_fn(x).await)
+        }
+    }
+}
+
 struct Foo;
 
 trait Bar {
@@ -176,6 +190,7 @@ fn main() {
         async_fn,
         generic_async_fn,
         async_fn_with_internal_borrow,
+        async_block_in_unsafe_block,
         Foo::async_assoc_item,
         |x| {
             async move {

src/test/ui/async-await/async-closure.rs

@@ -53,6 +53,21 @@ fn async_closure(x: u8) -> impl Future<Output = u8> {
     })(x)
 }
 
+fn async_closure_in_unsafe_block(x: u8) -> impl Future<Output = u8> {
+    (unsafe {
+        async move |x: u8| unsafe_fn(unsafe_async_fn(x).await)
+    })(x)
+}
+
+async unsafe fn unsafe_async_fn(x: u8) -> u8 {
+    wake_and_yield_once().await;
+    x
+}
+
+unsafe fn unsafe_fn(x: u8) -> u8 {
+    x
+}
+
 fn test_future_yields_once_then_returns<F, Fut>(f: F)
 where
     F: FnOnce(u8) -> Fut,
@@ -77,5 +92,6 @@ fn main() {
 
     test! {
         async_closure,
+        async_closure_in_unsafe_block,
     }
 }

src/test/ui/async-await/async-unsafe-fn-call-in-safe.rs

@@ -0,0 +1,21 @@
+// edition:2018
+
+#![feature(async_await)]
+
+struct S;
+
+impl S {
+    async unsafe fn f() {}
+}
+
+async unsafe fn f() {}
+
+async fn g() {
+    S::f(); //~ ERROR call to unsafe function is unsafe
+    f(); //~ ERROR call to unsafe function is unsafe
+}
+
+fn main() {
+    S::f(); //~ ERROR call to unsafe function is unsafe
+    f(); //~ ERROR call to unsafe function is unsafe
+}

src/test/ui/async-await/async-unsafe-fn-call-in-safe.stderr

@@ -0,0 +1,35 @@
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/async-unsafe-fn-call-in-safe.rs:14:5
+   |
+LL |     S::f();
+   |     ^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/async-unsafe-fn-call-in-safe.rs:15:5
+   |
+LL |     f();
+   |     ^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/async-unsafe-fn-call-in-safe.rs:19:5
+   |
+LL |     S::f();
+   |     ^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/async-unsafe-fn-call-in-safe.rs:20:5
+   |
+LL |     f();
+   |     ^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0133`.

src/test/ui/async-await/await-macro.rs

@@ -77,6 +77,12 @@ fn async_closure(x: u8) -> impl Future<Output = u8> {
     })(x)
 }
 
+fn async_closure_in_unsafe_block(x: u8) -> impl Future<Output = u8> {
+    (unsafe {
+        async move |x: u8| unsafe_fn(await!(unsafe_async_fn(x)))
+    })(x)
+}
+
 async fn async_fn(x: u8) -> u8 {
     await!(wake_and_yield_once());
     x
@@ -127,18 +133,34 @@ async unsafe fn unsafe_async_fn(x: u8) -> u8 {
     x
 }
 
+unsafe fn unsafe_fn(x: u8) -> u8 {
+    x
+}
+
+fn async_block_in_unsafe_block(x: u8) -> impl Future<Output = u8> {
+    unsafe {
+        async move {
+            unsafe_fn(await!(unsafe_async_fn(x)))
+        }
+    }
+}
+
 struct Foo;
 
 trait Bar {
     fn foo() {}
 }
 
 impl Foo {
-    async fn async_method(x: u8) -> u8 {
+    async fn async_assoc_item(x: u8) -> u8 {
         unsafe {
             await!(unsafe_async_fn(x))
         }
     }
+
+    async unsafe fn async_unsafe_assoc_item(x: u8) -> u8 {
+        await!(unsafe_async_fn(x))
+    }
 }
 
 fn test_future_yields_once_then_returns<F, Fut>(f: F)
@@ -177,15 +199,22 @@ fn main() {
         async_block,
         async_nonmove_block,
         async_closure,
+        async_closure_in_unsafe_block,
         async_fn,
         generic_async_fn,
         async_fn_with_internal_borrow,
-        Foo::async_method,
+        async_block_in_unsafe_block,
+        Foo::async_assoc_item,
         |x| {
             async move {
                 unsafe { await!(unsafe_async_fn(x)) }
             }
         },
+        |x| {
+            async move {
+                unsafe { await!(Foo::async_unsafe_assoc_item(x)) }
+            }
+        },
     }
     test_with_borrow! {
         async_block_with_borrow_named_lifetime,