3 files changed, 6 insertions, 12 deletions
diff --git a/src/test/ui/async-await/issue-61949-self-return-type.stderr b/src/test/ui/async-await/issue-61949-self-return-type.stderr
index 12fb77d8dd6..fe05754c83f 100644
--- a/src/test/ui/async-await/issue-61949-self-return-type.stderr
+++ b/src/test/ui/async-await/issue-61949-self-return-type.stderr
@@ -1,8 +1,9 @@
-error: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
+error[E0755]: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
   --> $DIR/issue-61949-self-return-type.rs:11:40
    |
 LL |     pub async fn new(_bar: &'a i32) -> Self {
-   |                                        ^^^^
+   |                                        ^^^^ help: consider spelling out the type instead: `Foo<'a>`
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0754`.
diff --git a/src/test/ui/async-await/issue-69276.stderr b/src/test/ui/async-await/issue-69276.stderr
deleted file mode 100644
index 1ebfdfa8b54..00000000000
--- a/src/test/ui/async-await/issue-69276.stderr
+++ /dev/null
@@ -1,8 +0,0 @@
-error: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
-  --> $DIR/issue-69276.rs:6:33
-   |
-LL |     async fn new(i: &'a i32) -> Self {
-   |                                 ^^^^
-
-error: aborting due to previous error
-
diff --git a/src/test/ui/impl-trait/bound-normalization-fail.stderr b/src/test/ui/impl-trait/bound-normalization-fail.stderr
index f5092044627..04b398f5b52 100644
--- a/src/test/ui/impl-trait/bound-normalization-fail.stderr
+++ b/src/test/ui/impl-trait/bound-normalization-fail.stderr
@@ -20,7 +20,7 @@ help: consider constraining the associated type `<T as impl_trait::Trait>::Assoc
 LL |     fn foo_fail<T: Trait<Assoc = ()>>() -> impl FooLike<Output=T::Assoc> {
    |                         ^^^^^^^^^^^^
 
-error: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
+error[E0755]: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
   --> $DIR/bound-normalization-fail.rs:43:41
    |
 LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output=T::Assoc> {
@@ -42,4 +42,5 @@ LL |     fn foo2_fail<'a, T: Trait<'a, Assoc = ()>>() -> impl FooLike<Output=T::
 
 error: aborting due to 3 previous errors; 1 warning emitted
 
-For more information about this error, try `rustc --explain E0271`.
+Some errors have detailed explanations: E0271, E0755.
+For more information about an error, try `rustc --explain E0271`.