Rollup merge of #97721 - compiler-errors:issue-97704, r=jackh726

Do `suggest_await_before_try` with infer variables in self, and clean up binders

Fixes #97704

Also cleans up binders in this fn, since everything is a `Poly*` and we really shouldn't have stray escaping late-bound regions everywhere. That's why the function changed so much. This isn't necessary, so I can revert if necessary.

3 files changed, 53 insertions, 0 deletions

diff --git a/src/test/ui/suggestions/issue-97704.fixed b/src/test/ui/suggestions/issue-97704.fixed
new file mode 100644
index 00000000000..c42bdfff5f9
--- /dev/null
+++ b/src/test/ui/suggestions/issue-97704.fixed
@@ -0,0 +1,19 @@
+// edition:2021
+// run-rustfix
+
+#![allow(unused)]
+
+use std::future::Future;
+
+async fn foo() -> Result<(), i32> {
+    func(async { Ok::<_, i32>(()) }).await?;
+    //~^ ERROR the `?` operator can only be applied to values that implement `Try`
+
+    Ok(())
+}
+
+async fn func<T>(fut: impl Future<Output = T>) -> T {
+    fut.await
+}
+
+fn main() {}
diff --git a/src/test/ui/suggestions/issue-97704.rs b/src/test/ui/suggestions/issue-97704.rs
new file mode 100644
index 00000000000..5dfee6cac60
--- /dev/null
+++ b/src/test/ui/suggestions/issue-97704.rs
@@ -0,0 +1,19 @@
+// edition:2021
+// run-rustfix
+
+#![allow(unused)]
+
+use std::future::Future;
+
+async fn foo() -> Result<(), i32> {
+    func(async { Ok::<_, i32>(()) })?;
+    //~^ ERROR the `?` operator can only be applied to values that implement `Try`
+
+    Ok(())
+}
+
+async fn func<T>(fut: impl Future<Output = T>) -> T {
+    fut.await
+}
+
+fn main() {}
diff --git a/src/test/ui/suggestions/issue-97704.stderr b/src/test/ui/suggestions/issue-97704.stderr
new file mode 100644
index 00000000000..ca017be45ac
--- /dev/null
+++ b/src/test/ui/suggestions/issue-97704.stderr
@@ -0,0 +1,15 @@
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/issue-97704.rs:9:5
+   |
+LL |     func(async { Ok::<_, i32>(()) })?;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `?` operator cannot be applied to type `impl Future<Output = Result<(), i32>>`
+   |
+   = help: the trait `Try` is not implemented for `impl Future<Output = Result<(), i32>>`
+help: consider `await`ing on the `Future`
+   |
+LL |     func(async { Ok::<_, i32>(()) }).await?;
+   |                                     ++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.