Rollup merge of #82021 - csmoe:issue-78600, r=tmandry

Spell out nested Self type in lint message

Closes #78600
r? `@tmandry`

2 files changed, 23 insertions, 0 deletions

diff --git a/src/test/ui/async-await/issues/issue-78600.rs b/src/test/ui/async-await/issues/issue-78600.rs
new file mode 100644
index 00000000000..8aaeaecf3e1
--- /dev/null
+++ b/src/test/ui/async-await/issues/issue-78600.rs
@@ -0,0 +1,12 @@
+// edition:2018
+
+struct S<'a>(&'a i32);
+
+impl<'a> S<'a> {
+    async fn new(i: &'a i32) -> Result<Self, ()> {
+        //~^ ERROR: `async fn`
+        Ok(S(&22))
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/async-await/issues/issue-78600.stderr b/src/test/ui/async-await/issues/issue-78600.stderr
new file mode 100644
index 00000000000..92b66147106
--- /dev/null
+++ b/src/test/ui/async-await/issues/issue-78600.stderr
@@ -0,0 +1,11 @@
+error[E0760]: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
+  --> $DIR/issue-78600.rs:6:33
+   |
+LL |     async fn new(i: &'a i32) -> Result<Self, ()> {
+   |                                 ^^^^^^^----^^^^^
+   |                                        |
+   |                                        help: consider spelling out the type instead: `S<'a>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0760`.