Error on using yield without also using #[coroutine] on the closure

And suggest adding the `#[coroutine]` to the closure

Author: oli-obk

tests/ui/crashes/ice-5238.rs

@@ -1,9 +1,9 @@
 // Regression test for #5238 / https://github.com/rust-lang/rust/pull/69562
 
-#![feature(coroutines, coroutine_trait)]
+#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
 
 fn main() {
-    let _ = || {
+    let _ = #[coroutine] || {
         yield;
     };
 }

tests/ui/large_futures.fixed

@@ -1,4 +1,3 @@
-#![feature(coroutines)]
 #![warn(clippy::large_futures)]
 #![allow(clippy::never_loop)]
 #![allow(clippy::future_not_send)]

tests/ui/large_futures.rs

@@ -1,4 +1,3 @@
-#![feature(coroutines)]
 #![warn(clippy::large_futures)]
 #![allow(clippy::never_loop)]
 #![allow(clippy::future_not_send)]

tests/ui/large_futures.stderr

@@ -1,5 +1,5 @@
 error: large future with a size of 16385 bytes
-  --> tests/ui/large_futures.rs:11:9
+  --> tests/ui/large_futures.rs:10:9
    |
 LL |         big_fut([0u8; 1024 * 16]).await;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider `Box::pin` on it: `Box::pin(big_fut([0u8; 1024 * 16]))`
@@ -8,37 +8,37 @@ LL |         big_fut([0u8; 1024 * 16]).await;
    = help: to override `-D warnings` add `#[allow(clippy::large_futures)]`
 
 error: large future with a size of 16386 bytes
-  --> tests/ui/large_futures.rs:15:5
+  --> tests/ui/large_futures.rs:14:5
    |
 LL |     f.await
    |     ^ help: consider `Box::pin` on it: `Box::pin(f)`
 
 error: large future with a size of 16387 bytes
-  --> tests/ui/large_futures.rs:20:9
+  --> tests/ui/large_futures.rs:19:9
    |
 LL |         wait().await;
    |         ^^^^^^ help: consider `Box::pin` on it: `Box::pin(wait())`
 
 error: large future with a size of 16387 bytes
-  --> tests/ui/large_futures.rs:25:13
+  --> tests/ui/large_futures.rs:24:13
    |
 LL |             wait().await;
    |             ^^^^^^ help: consider `Box::pin` on it: `Box::pin(wait())`
 
 error: large future with a size of 65540 bytes
-  --> tests/ui/large_futures.rs:33:5
+  --> tests/ui/large_futures.rs:32:5
    |
 LL |     foo().await;
    |     ^^^^^ help: consider `Box::pin` on it: `Box::pin(foo())`
 
 error: large future with a size of 49159 bytes
-  --> tests/ui/large_futures.rs:35:5
+  --> tests/ui/large_futures.rs:34:5
    |
 LL |     calls_fut(fut).await;
    |     ^^^^^^^^^^^^^^ help: consider `Box::pin` on it: `Box::pin(calls_fut(fut))`
 
 error: large future with a size of 65540 bytes
-  --> tests/ui/large_futures.rs:48:5
+  --> tests/ui/large_futures.rs:47:5
    |
 LL | /     async {
 LL | |
@@ -59,7 +59,7 @@ LL +     })
    |
 
 error: large future with a size of 65540 bytes
-  --> tests/ui/large_futures.rs:60:13
+  --> tests/ui/large_futures.rs:59:13
    |
 LL | /             async {
 LL | |                 let x = [0i32; 1024 * 16];

tests/ui/redundant_locals.rs

@@ -1,7 +1,7 @@
 //@aux-build:proc_macros.rs
 #![allow(unused, clippy::no_effect, clippy::needless_pass_by_ref_mut)]
 #![warn(clippy::redundant_locals)]
-#![feature(async_closure, coroutines)]
+#![feature(async_closure, coroutines, stmt_expr_attributes)]
 
 extern crate proc_macros;
 use proc_macros::{external, with_span};
@@ -191,11 +191,11 @@ fn issue12225() {
         let v4 = v4;
         dbg!(&v4);
     });
-    assert_static(static || {
+    assert_static(#[coroutine] static || {
         let v5 = v5;
         yield;
     });
-    assert_static(|| {
+    assert_static(#[coroutine] || {
         let v6 = v6;
         yield;
     });