diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index 408da6d5d86..0b09e9fbb85 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -578,7 +578,7 @@ declare_features! (
     /// be used to describe E or vise-versa.
     (unstable, result_ffi_guarantees, "1.80.0", Some(110503)),
     /// Allows bounding the return type of AFIT/RPITIT.
-    (incomplete, return_type_notation, "1.70.0", Some(109417)),
+    (unstable, return_type_notation, "1.70.0", Some(109417)),
     /// Allows `extern "rust-cold"`.
     (unstable, rust_cold_cc, "1.63.0", Some(97544)),
     /// Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
diff --git a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.rs b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.rs
index af64901ace0..f00aaec1a8c 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.rs
@@ -1,7 +1,6 @@
 //@ edition: 2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     async fn method() {}
diff --git a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
index 68081470087..c6b9f3eff90 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/bad-inputs-and-output.stderr
@@ -1,66 +1,57 @@
 error[E0575]: expected associated type, found associated function `Trait::method`
-  --> $DIR/bad-inputs-and-output.rs:28:36
+  --> $DIR/bad-inputs-and-output.rs:27:36
    |
 LL | fn foo_qualified<T: Trait>() where <T as Trait>::method(i32): Send {}
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ not a associated type
 
 error[E0575]: expected associated type, found associated function `Trait::method`
-  --> $DIR/bad-inputs-and-output.rs:31:36
+  --> $DIR/bad-inputs-and-output.rs:30:36
    |
 LL | fn bar_qualified<T: Trait>() where <T as Trait>::method() -> (): Send {}
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not a associated type
 
 error[E0575]: expected associated type, found associated function `Trait::method`
-  --> $DIR/bad-inputs-and-output.rs:34:36
+  --> $DIR/bad-inputs-and-output.rs:33:36
    |
 LL | fn baz_qualified<T: Trait>() where <T as Trait>::method(): Send {}
    |                                    ^^^^^^^^^^^^^^^^^^^^^^ not a associated type
 
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/bad-inputs-and-output.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: argument types not allowed with return type notation
-  --> $DIR/bad-inputs-and-output.rs:10:23
+  --> $DIR/bad-inputs-and-output.rs:9:23
    |
 LL | fn foo<T: Trait<method(i32): Send>>() {}
    |                       ^^^^^ help: remove the input types: `()`
 
 error: return type not allowed with return type notation
-  --> $DIR/bad-inputs-and-output.rs:13:25
+  --> $DIR/bad-inputs-and-output.rs:12:25
    |
 LL | fn bar<T: Trait<method() -> (): Send>>() {}
    |                         ^^^^^^ help: remove the return type
 
 error: return type notation arguments must be elided with `..`
-  --> $DIR/bad-inputs-and-output.rs:16:23
+  --> $DIR/bad-inputs-and-output.rs:15:23
    |
 LL | fn baz<T: Trait<method(): Send>>() {}
    |                       ^^ help: add `..`: `(..)`
 
 error: argument types not allowed with return type notation
-  --> $DIR/bad-inputs-and-output.rs:19:40
+  --> $DIR/bad-inputs-and-output.rs:18:40
    |
 LL | fn foo_path<T: Trait>() where T::method(i32): Send {}
    |                                        ^^^^^ help: remove the input types: `()`
 
 error: return type not allowed with return type notation
-  --> $DIR/bad-inputs-and-output.rs:22:42
+  --> $DIR/bad-inputs-and-output.rs:21:42
    |
 LL | fn bar_path<T: Trait>() where T::method() -> (): Send {}
    |                                          ^^^^^^ help: remove the return type
 
 error: return type notation arguments must be elided with `..`
-  --> $DIR/bad-inputs-and-output.rs:25:40
+  --> $DIR/bad-inputs-and-output.rs:24:40
    |
 LL | fn baz_path<T: Trait>() where T::method(): Send {}
    |                                        ^^ help: add `..`: `(..)`
 
-error: aborting due to 9 previous errors; 1 warning emitted
+error: aborting due to 9 previous errors
 
 For more information about this error, try `rustc --explain E0575`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/bare-path.rs b/tests/ui/associated-type-bounds/return-type-notation/bare-path.rs
index 185c0523633..2bbeb62b922 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/bare-path.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/bare-path.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Tr {
     const CONST: usize;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/bare-path.stderr b/tests/ui/associated-type-bounds/return-type-notation/bare-path.stderr
index dca2bdeab0a..913f84b924c 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/bare-path.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/bare-path.stderr
@@ -1,23 +1,14 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/bare-path.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation not allowed in this position yet
-  --> $DIR/bare-path.rs:15:23
+  --> $DIR/bare-path.rs:14:23
    |
 LL |     let _ = T::CONST::(..);
    |                       ^^^^
 
 error: return type notation not allowed in this position yet
-  --> $DIR/bare-path.rs:17:12
+  --> $DIR/bare-path.rs:16:12
    |
 LL |     let _: T::method(..);
    |            ^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/basic.rs b/tests/ui/associated-type-bounds/return-type-notation/basic.rs
index be489a19a7a..cb5872dff44 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/basic.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/basic.rs
@@ -3,7 +3,6 @@
 //@ [with] check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     async fn method() -> Result<(), ()>;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/basic.with.stderr b/tests/ui/associated-type-bounds/return-type-notation/basic.with.stderr
deleted file mode 100644
index 9d4bb356caa..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/basic.with.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/basic.rs:5:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr b/tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr
index e9fd8503296..110d2a00583 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/basic.without.stderr
@@ -1,29 +1,20 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/basic.rs:5:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: future cannot be sent between threads safely
-  --> $DIR/basic.rs:23:13
+  --> $DIR/basic.rs:22:13
    |
 LL |     is_send(foo::<T>());
    |             ^^^^^^^^^^ future returned by `foo` is not `Send`
    |
    = help: within `impl Future<Output = Result<(), ()>>`, the trait `Send` is not implemented for `impl Future<Output = Result<(), ()>> { <T as Foo>::method(..) }`, which is required by `impl Future<Output = Result<(), ()>>: Send`
 note: future is not `Send` as it awaits another future which is not `Send`
-  --> $DIR/basic.rs:13:5
+  --> $DIR/basic.rs:12:5
    |
 LL |     T::method().await?;
    |     ^^^^^^^^^^^ await occurs here on type `impl Future<Output = Result<(), ()>> { <T as Foo>::method(..) }`, which is not `Send`
 note: required by a bound in `is_send`
-  --> $DIR/basic.rs:17:20
+  --> $DIR/basic.rs:16:20
    |
 LL | fn is_send(_: impl Send) {}
    |                    ^^^^ required by this bound in `is_send`
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/display.rs b/tests/ui/associated-type-bounds/return-type-notation/display.rs
index c5be2ca00ea..2d613b71c55 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/display.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/display.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {}
 fn needs_trait(_: impl Trait) {}
diff --git a/tests/ui/associated-type-bounds/return-type-notation/display.stderr b/tests/ui/associated-type-bounds/return-type-notation/display.stderr
index 4915ec1aa83..b895d796952 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/display.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/display.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/display.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0277]: the trait bound `impl Sized { <T as Assoc>::method(..) }: Trait` is not satisfied
-  --> $DIR/display.rs:15:17
+  --> $DIR/display.rs:14:17
    |
 LL |     needs_trait(T::method());
    |     ----------- ^^^^^^^^^^^ the trait `Trait` is not implemented for `impl Sized { <T as Assoc>::method(..) }`
@@ -16,13 +7,13 @@ LL |     needs_trait(T::method());
    |     required by a bound introduced by this call
    |
 note: required by a bound in `needs_trait`
-  --> $DIR/display.rs:5:24
+  --> $DIR/display.rs:4:24
    |
 LL | fn needs_trait(_: impl Trait) {}
    |                        ^^^^^ required by this bound in `needs_trait`
 
 error[E0277]: the trait bound `impl Sized { <T as Assoc>::method_with_lt(..) }: Trait` is not satisfied
-  --> $DIR/display.rs:17:17
+  --> $DIR/display.rs:16:17
    |
 LL |     needs_trait(T::method_with_lt());
    |     ----------- ^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `impl Sized { <T as Assoc>::method_with_lt(..) }`
@@ -30,13 +21,13 @@ LL |     needs_trait(T::method_with_lt());
    |     required by a bound introduced by this call
    |
 note: required by a bound in `needs_trait`
-  --> $DIR/display.rs:5:24
+  --> $DIR/display.rs:4:24
    |
 LL | fn needs_trait(_: impl Trait) {}
    |                        ^^^^^ required by this bound in `needs_trait`
 
 error[E0277]: the trait bound `impl Sized: Trait` is not satisfied
-  --> $DIR/display.rs:19:17
+  --> $DIR/display.rs:18:17
    |
 LL |     needs_trait(T::method_with_ty());
    |     ----------- ^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `impl Sized`
@@ -44,18 +35,18 @@ LL |     needs_trait(T::method_with_ty());
    |     required by a bound introduced by this call
    |
 help: this trait has no implementations, consider adding one
-  --> $DIR/display.rs:4:1
+  --> $DIR/display.rs:3:1
    |
 LL | trait Trait {}
    | ^^^^^^^^^^^
 note: required by a bound in `needs_trait`
-  --> $DIR/display.rs:5:24
+  --> $DIR/display.rs:4:24
    |
 LL | fn needs_trait(_: impl Trait) {}
    |                        ^^^^^ required by this bound in `needs_trait`
 
 error[E0277]: the trait bound `impl Sized: Trait` is not satisfied
-  --> $DIR/display.rs:21:17
+  --> $DIR/display.rs:20:17
    |
 LL |     needs_trait(T::method_with_ct());
    |     ----------- ^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `impl Sized`
@@ -63,16 +54,16 @@ LL |     needs_trait(T::method_with_ct());
    |     required by a bound introduced by this call
    |
 help: this trait has no implementations, consider adding one
-  --> $DIR/display.rs:4:1
+  --> $DIR/display.rs:3:1
    |
 LL | trait Trait {}
    | ^^^^^^^^^^^
 note: required by a bound in `needs_trait`
-  --> $DIR/display.rs:5:24
+  --> $DIR/display.rs:4:24
    |
 LL | fn needs_trait(_: impl Trait) {}
    |                        ^^^^^ required by this bound in `needs_trait`
 
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/equality.rs b/tests/ui/associated-type-bounds/return-type-notation/equality.rs
index 95c16fa1e3f..cff0df58b74 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/equality.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/equality.rs
@@ -1,7 +1,6 @@
 //@ edition: 2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 use std::future::Future;
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/equality.stderr b/tests/ui/associated-type-bounds/return-type-notation/equality.stderr
index d76b1bd1c05..870f17ee70d 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/equality.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/equality.stderr
@@ -1,17 +1,8 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/equality.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation is not allowed to use type equality
-  --> $DIR/equality.rs:12:18
+  --> $DIR/equality.rs:11:18
    |
 LL | fn test<T: Trait<method(..) = Box<dyn Future<Output = ()>>>>() {}
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs b/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs
index d4f21f47c6c..c6ae6690c72 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait<'a> {
     fn late<'b>(&'b self, _: &'a ()) -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.stderr b/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.stderr
deleted file mode 100644
index c67231c07f7..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/higher-ranked-bound-works.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/higher-ranked-bound-works.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.rs b/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.rs
index 4d026b7d1d8..69d0b4b1f8a 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.rs
@@ -1,7 +1,6 @@
 //@ edition: 2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait HealthCheck {
     async fn check<const N: usize>() -> bool;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.stderr b/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.stderr
index 12f32a75eda..2abf47f0026 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/issue-120208-higher-ranked-const.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-120208-higher-ranked-const.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation is not allowed for functions that have const parameters
-  --> $DIR/issue-120208-higher-ranked-const.rs:12:21
+  --> $DIR/issue-120208-higher-ranked-const.rs:11:21
    |
 LL |     async fn check<const N: usize>() -> bool;
    |                    -------------- const parameter declared here
@@ -16,5 +7,5 @@ LL |     async fn check<const N: usize>() -> bool;
 LL |     HC: HealthCheck<check(..): Send> + Send + 'static,
    |                     ^^^^^^^^^^^^^^^
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/missing.rs b/tests/ui/associated-type-bounds/return-type-notation/missing.rs
index 3a04a56339b..e116ae0ca3b 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/missing.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/missing.rs
@@ -1,7 +1,6 @@
 //@ edition: 2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     async fn method() {}
diff --git a/tests/ui/associated-type-bounds/return-type-notation/missing.stderr b/tests/ui/associated-type-bounds/return-type-notation/missing.stderr
index 5cb8e2642f5..0eb96560343 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/missing.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/missing.stderr
@@ -1,18 +1,9 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/missing.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0220]: associated function `methid` not found for `Trait`
-  --> $DIR/missing.rs:10:17
+  --> $DIR/missing.rs:9:17
    |
 LL | fn bar<T: Trait<methid(..): Send>>() {}
    |                 ^^^^^^ help: there is an associated function with a similar name: `method`
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0220`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.rs b/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.rs
index 9bdc2d00233..8dfc2376fbd 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.rs
@@ -2,7 +2,6 @@
 
 #![allow(non_camel_case_types)]
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     type test;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.stderr b/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.stderr
deleted file mode 100644
index f4ece074b28..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/namespace-conflict.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/namespace-conflict.rs:4:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.rs b/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.rs
index 35d6dd799c7..0e9dd900952 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() {}
diff --git a/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.stderr b/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.stderr
index e308c927bf0..4d3dac2d168 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/non-rpitit.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/non-rpitit.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation used on function that is not `async` and does not return `impl Trait`
-  --> $DIR/non-rpitit.rs:8:19
+  --> $DIR/non-rpitit.rs:7:19
    |
 LL |     fn method() {}
    |     ----------- this function must be `async` or return `impl Trait`
@@ -19,7 +10,7 @@ LL | fn bound<T: Trait<method(..): Send>>() {}
    = note: function returns `()`, which is not compatible with associated type return bounds
 
 error: return type notation used on function that is not `async` and does not return `impl Trait`
-  --> $DIR/non-rpitit.rs:11:30
+  --> $DIR/non-rpitit.rs:10:30
    |
 LL |     fn method() {}
    |     ----------- this function must be `async` or return `impl Trait`
@@ -29,5 +20,5 @@ LL | fn path<T>() where T: Trait, T::method(..): Send {}
    |
    = note: function returns `()`, which is not compatible with associated type return bounds
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/not-a-method.rs b/tests/ui/associated-type-bounds/return-type-notation/not-a-method.rs
index d94ec6b74d9..89a414a3bc8 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/not-a-method.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/not-a-method.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 fn function() {}
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/not-a-method.stderr b/tests/ui/associated-type-bounds/return-type-notation/not-a-method.stderr
index 8add2d46296..ab987ee48e6 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/not-a-method.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/not-a-method.stderr
@@ -1,49 +1,40 @@
 error[E0575]: expected function, found function `function`
-  --> $DIR/not-a-method.rs:8:5
+  --> $DIR/not-a-method.rs:7:5
    |
 LL |     function(..): Send,
    |     ^^^^^^^^^^^^ not a function
 
 error[E0573]: expected type, found function `function`
-  --> $DIR/not-a-method.rs:16:5
+  --> $DIR/not-a-method.rs:15:5
    |
 LL |     function(): Send,
    |     ^^^^^^^^^^ not a type
 
 error[E0576]: cannot find function `method` in this scope
-  --> $DIR/not-a-method.rs:28:5
+  --> $DIR/not-a-method.rs:27:5
    |
 LL |     method(..): Send,
    |     ^^^^^^ not found in this scope
 
 error[E0412]: cannot find type `method` in this scope
-  --> $DIR/not-a-method.rs:37:5
+  --> $DIR/not-a-method.rs:36:5
    |
 LL |     method(): Send,
    |     ^^^^^^ not found in this scope
 
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/not-a-method.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation not allowed in this position yet
-  --> $DIR/not-a-method.rs:8:5
+  --> $DIR/not-a-method.rs:7:5
    |
 LL |     function(..): Send,
    |     ^^^^^^^^^^^^
 
 error: return type notation not allowed in this position yet
-  --> $DIR/not-a-method.rs:28:5
+  --> $DIR/not-a-method.rs:27:5
    |
 LL |     method(..): Send,
    |     ^^^^^^^^^^
 
-error: aborting due to 6 previous errors; 1 warning emitted
+error: aborting due to 6 previous errors
 
 Some errors have detailed explanations: E0412, E0573, E0575, E0576.
 For more information about an error, try `rustc --explain E0412`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.rs b/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.rs
index cb42c33e364..f9aba175465 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait A {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.stderr
index e841049ac66..80705424035 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-ambiguous.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-ambiguous.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0221]: ambiguous associated function `method` in bounds of `T`
-  --> $DIR/path-ambiguous.rs:13:5
+  --> $DIR/path-ambiguous.rs:12:5
    |
 LL |     fn method() -> impl Sized;
    |     -------------------------- ambiguous `method` from `A`
@@ -29,7 +20,7 @@ LL |     <T as A>::method(..): Send,
    |     ~~~~~~~~~~
 
 error[E0221]: ambiguous associated function `method` in bounds of `T`
-  --> $DIR/path-ambiguous.rs:22:5
+  --> $DIR/path-ambiguous.rs:21:5
    |
 LL |     fn method() -> impl Sized;
    |     -------------------------- ambiguous `method` from `A`
@@ -49,6 +40,6 @@ help: use fully-qualified syntax to disambiguate
 LL |     <T as A>::method(..): Send,
    |     ~~~~~~~~~~
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0221`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.rs b/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.rs
index 56abd167fb6..d8bdec09107 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.stderr
deleted file mode 100644
index 3db033d8cf5..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/path-constrained-in-method.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-constrained-in-method.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.rs b/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.rs
index a4d8f005371..8591357dd9e 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait A<'a> {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.stderr
index 22de6165503..2a9a1a1e899 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-higher-ranked.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-higher-ranked.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0212]: cannot use the associated function of a trait with uninferred generic parameters
-  --> $DIR/path-higher-ranked.rs:12:5
+  --> $DIR/path-higher-ranked.rs:11:5
    |
 LL |     T::method(..): Send,
    |     ^^^^^^^^^^^^^
@@ -19,7 +10,7 @@ LL |     <T as A<'_>>::method(..): Send,
    |     ~~~~~~~~~~~~~~
 
 error[E0212]: cannot use the associated function of a trait with uninferred generic parameters
-  --> $DIR/path-higher-ranked.rs:20:5
+  --> $DIR/path-higher-ranked.rs:19:5
    |
 LL |     T::method(..): Send,
    |     ^^^^^^^^^^^^^
@@ -29,6 +20,6 @@ help: use a fully qualified path with inferred lifetimes
 LL |     <T as A<'_>>::method(..): Send,
    |     ~~~~~~~~~~~~~~
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0212`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-missing.rs b/tests/ui/associated-type-bounds/return-type-notation/path-missing.rs
index c1a7b95ca2d..8cab48bd0c4 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-missing.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-missing.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait A {
     #[allow(non_camel_case_types)]
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-missing.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-missing.stderr
index 0130c3bc614..edac09db89d 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-missing.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-missing.stderr
@@ -1,33 +1,24 @@
 error[E0576]: cannot find method or associated constant `method` in trait `A`
-  --> $DIR/path-missing.rs:11:15
+  --> $DIR/path-missing.rs:10:15
    |
 LL |     <T as A>::method(..): Send,
    |               ^^^^^^ not found in `A`
 
 error[E0575]: expected method or associated constant, found associated type `A::bad`
-  --> $DIR/path-missing.rs:13:5
+  --> $DIR/path-missing.rs:12:5
    |
 LL |     <T as A>::bad(..): Send,
    |     ^^^^^^^^^^^^^^^^^
    |
    = note: can't use a type alias as a constructor
 
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-missing.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0220]: associated function `method` not found for `T`
-  --> $DIR/path-missing.rs:20:8
+  --> $DIR/path-missing.rs:19:8
    |
 LL |     T::method(..): Send,
    |        ^^^^^^ associated function `method` not found
 
-error: aborting due to 3 previous errors; 1 warning emitted
+error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0220, E0575, E0576.
 For more information about an error, try `rustc --explain E0220`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.rs b/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.rs
index d2636789c10..17a3d0f7af6 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.stderr
index d66b0a109fc..6dbb5dabc0e 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-no-qself.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-no-qself.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0223]: ambiguous associated type
-  --> $DIR/path-no-qself.rs:10:5
+  --> $DIR/path-no-qself.rs:9:5
    |
 LL |     Trait::method(..): Send,
    |     ^^^^^^^^^^^^^^^^^
@@ -18,6 +9,6 @@ help: if there were a type named `Example` that implemented `Trait`, you could u
 LL |     <Example as Trait>::method: Send,
    |     ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0223`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.rs b/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.rs
index b0e6ea852b0..8107772f151 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.stderr
index cd1aa9813e3..38202bdbf07 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-non-param-qself.stderr
@@ -1,30 +1,21 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-non-param-qself.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0223]: ambiguous associated function
-  --> $DIR/path-non-param-qself.rs:12:5
+  --> $DIR/path-non-param-qself.rs:11:5
    |
 LL |     <()>::method(..): Send,
    |     ^^^^^^^^^^^^^^^^
 
 error[E0223]: ambiguous associated function
-  --> $DIR/path-non-param-qself.rs:14:5
+  --> $DIR/path-non-param-qself.rs:13:5
    |
 LL |     i32::method(..): Send,
    |     ^^^^^^^^^^^^^^^
 
 error[E0223]: ambiguous associated function
-  --> $DIR/path-non-param-qself.rs:16:5
+  --> $DIR/path-non-param-qself.rs:15:5
    |
 LL |     Adt::method(..): Send,
    |     ^^^^^^^^^^^^^^^
 
-error: aborting due to 3 previous errors; 1 warning emitted
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0223`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.rs b/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.rs
index 0cf84457ba7..d805556f4c7 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.stderr
deleted file mode 100644
index ab33647583c..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/path-self-qself.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-self-qself.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-type-param.rs b/tests/ui/associated-type-bounds/return-type-notation/path-type-param.rs
index 693a300eb1d..6e2355c389b 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-type-param.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-type-param.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     fn method<T>() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-type-param.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-type-param.stderr
index 0d33d4f97d7..67e83060a76 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-type-param.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-type-param.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-type-param.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation is not allowed for functions that have type parameters
-  --> $DIR/path-type-param.rs:10:5
+  --> $DIR/path-type-param.rs:9:5
    |
 LL |     fn method<T>() -> impl Sized;
    |               - type parameter declared here
@@ -17,7 +8,7 @@ LL |     <T as Foo>::method(..): Send,
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
 error: return type notation is not allowed for functions that have type parameters
-  --> $DIR/path-type-param.rs:17:5
+  --> $DIR/path-type-param.rs:16:5
    |
 LL |     fn method<T>() -> impl Sized;
    |               - type parameter declared here
@@ -25,5 +16,5 @@ LL |     fn method<T>() -> impl Sized;
 LL |     <T as Foo>::method(..): Send,
    |     ^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.rs b/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.rs
index a5b0b0e4e25..c9cb0f953e2 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.stderr
index 7d32a428555..95810342d5a 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.stderr
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-unsatisfied.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-unsatisfied.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0277]: `*mut ()` cannot be sent between threads safely
-  --> $DIR/path-unsatisfied.rs:23:12
+  --> $DIR/path-unsatisfied.rs:22:12
    |
 LL |     fn method() -> impl Sized {
    |                    ---------- within this `impl Sized`
@@ -18,12 +9,12 @@ LL |     test::<DoesntWork>();
    |
    = help: within `impl Sized`, the trait `Send` is not implemented for `*mut ()`, which is required by `impl Sized: Send`
 note: required because it appears within the type `impl Sized`
-  --> $DIR/path-unsatisfied.rs:10:20
+  --> $DIR/path-unsatisfied.rs:9:20
    |
 LL |     fn method() -> impl Sized {
    |                    ^^^^^^^^^^
 note: required by a bound in `test`
-  --> $DIR/path-unsatisfied.rs:18:20
+  --> $DIR/path-unsatisfied.rs:17:20
    |
 LL | fn test<T: Trait>()
    |    ---- required by a bound in this function
@@ -31,6 +22,6 @@ LL | where
 LL |     T::method(..): Send,
    |                    ^^^^ required by this bound in `test`
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-works.rs b/tests/ui/associated-type-bounds/return-type-notation/path-works.rs
index 027bc89f13e..87abfc07ee9 100644
--- a/tests/ui/associated-type-bounds/return-type-notation/path-works.rs
+++ b/tests/ui/associated-type-bounds/return-type-notation/path-works.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Trait {
     fn method() -> impl Sized;
diff --git a/tests/ui/associated-type-bounds/return-type-notation/path-works.stderr b/tests/ui/associated-type-bounds/return-type-notation/path-works.stderr
deleted file mode 100644
index b1ec8069ba0..00000000000
--- a/tests/ui/associated-type-bounds/return-type-notation/path-works.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/path-works.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/issue-110963-early.stderr b/tests/ui/async-await/return-type-notation/issue-110963-early.stderr
index acad8bd3791..d6c3bd12aee 100644
--- a/tests/ui/async-await/return-type-notation/issue-110963-early.stderr
+++ b/tests/ui/async-await/return-type-notation/issue-110963-early.stderr
@@ -1,12 +1,3 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-110963-early.rs:4:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: implementation of `Send` is not general enough
   --> $DIR/issue-110963-early.rs:14:5
    |
@@ -36,5 +27,5 @@ LL | |     });
    = note: ...but `Send` is actually implemented for the type `impl Future<Output = bool> { <HC as HealthCheck>::check<'2>(..) }`, for some specific lifetime `'2`
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/async-await/return-type-notation/issue-110963-late.rs b/tests/ui/async-await/return-type-notation/issue-110963-late.rs
index cb9c0b97f1e..1f56361f5e5 100644
--- a/tests/ui/async-await/return-type-notation/issue-110963-late.rs
+++ b/tests/ui/async-await/return-type-notation/issue-110963-late.rs
@@ -2,7 +2,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait HealthCheck {
     async fn check(&mut self) -> bool;
diff --git a/tests/ui/async-await/return-type-notation/issue-110963-late.stderr b/tests/ui/async-await/return-type-notation/issue-110963-late.stderr
deleted file mode 100644
index 9c6966537a7..00000000000
--- a/tests/ui/async-await/return-type-notation/issue-110963-late.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-110963-late.rs:4:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.current.stderr b/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.current.stderr
deleted file mode 100644
index 4837815fad4..00000000000
--- a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.current.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/normalizing-self-auto-trait-issue-109924.rs:7:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.next.stderr b/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.next.stderr
deleted file mode 100644
index 4837815fad4..00000000000
--- a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.next.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/normalizing-self-auto-trait-issue-109924.rs:7:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.rs b/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.rs
index 24041ed0807..3fbd74eddcb 100644
--- a/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.rs
+++ b/tests/ui/async-await/return-type-notation/normalizing-self-auto-trait-issue-109924.rs
@@ -5,7 +5,6 @@
 //@ edition:2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     async fn bar(&self);
diff --git a/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.rs b/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.rs
index 2f6e04c3853..fdbeb4f3c87 100644
--- a/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.rs
+++ b/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.rs
@@ -2,7 +2,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 use std::future::Future;
 
diff --git a/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.stderr b/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.stderr
deleted file mode 100644
index 4a52e807bff..00000000000
--- a/tests/ui/async-await/return-type-notation/rtn-implied-in-supertrait.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/rtn-implied-in-supertrait.rs:4:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.rs b/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.rs
index 1e971d0aea7..bbdfcf60731 100644
--- a/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.rs
+++ b/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.rs
@@ -1,5 +1,4 @@
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 // Shouldn't ICE when we have a (bad) RTN in an impl header
 
diff --git a/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.stderr b/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.stderr
index e061587f491..2bbf1d50474 100644
--- a/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.stderr
+++ b/tests/ui/async-await/return-type-notation/rtn-in-impl-signature.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/rtn-in-impl-signature.rs:1:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0229]: associated item constraints are not allowed here
-  --> $DIR/rtn-in-impl-signature.rs:10:17
+  --> $DIR/rtn-in-impl-signature.rs:9:17
    |
 LL | impl Super1<'_, bar(..): Send> for () {}
    |                 ^^^^^^^^^^^^^ associated item constraint not allowed here
@@ -20,7 +11,7 @@ LL + impl Super1<'_> for () {}
    |
 
 error[E0046]: not all trait items implemented, missing: `bar`
-  --> $DIR/rtn-in-impl-signature.rs:10:1
+  --> $DIR/rtn-in-impl-signature.rs:9:1
    |
 LL |     fn bar<'b>() -> bool;
    |     --------------------- `bar` from trait
@@ -28,7 +19,7 @@ LL |     fn bar<'b>() -> bool;
 LL | impl Super1<'_, bar(..): Send> for () {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `bar` in implementation
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0046, E0229.
 For more information about an error, try `rustc --explain E0046`.
diff --git a/tests/ui/async-await/return-type-notation/super-method-bound-ambig.rs b/tests/ui/async-await/return-type-notation/super-method-bound-ambig.rs
index 452568f3e46..1db19628fa3 100644
--- a/tests/ui/async-await/return-type-notation/super-method-bound-ambig.rs
+++ b/tests/ui/async-await/return-type-notation/super-method-bound-ambig.rs
@@ -1,7 +1,6 @@
 //@ edition:2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Super1<'a> {
     async fn test();
diff --git a/tests/ui/async-await/return-type-notation/super-method-bound-ambig.stderr b/tests/ui/async-await/return-type-notation/super-method-bound-ambig.stderr
index 9a6fdd7f2ac..e32b07771dc 100644
--- a/tests/ui/async-await/return-type-notation/super-method-bound-ambig.stderr
+++ b/tests/ui/async-await/return-type-notation/super-method-bound-ambig.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/super-method-bound-ambig.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0221]: ambiguous associated function `test` in bounds of `Foo`
-  --> $DIR/super-method-bound-ambig.rs:25:12
+  --> $DIR/super-method-bound-ambig.rs:24:12
    |
 LL |     async fn test();
    |     ---------------- ambiguous `test` from `for<'a> Super1<'a>`
@@ -19,6 +10,6 @@ LL |     async fn test();
 LL |     T: Foo<test(..): Send>,
    |            ^^^^^^^^^^^^^^ ambiguous associated function `test`
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0221`.
diff --git a/tests/ui/async-await/return-type-notation/super-method-bound.rs b/tests/ui/async-await/return-type-notation/super-method-bound.rs
index 1aa8258a09b..a1d03076982 100644
--- a/tests/ui/async-await/return-type-notation/super-method-bound.rs
+++ b/tests/ui/async-await/return-type-notation/super-method-bound.rs
@@ -2,7 +2,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Super<'a> {
     async fn test();
diff --git a/tests/ui/async-await/return-type-notation/super-method-bound.stderr b/tests/ui/async-await/return-type-notation/super-method-bound.stderr
deleted file mode 100644
index 64fda71c1a1..00000000000
--- a/tests/ui/async-await/return-type-notation/super-method-bound.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/super-method-bound.rs:4:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/supertrait-bound.rs b/tests/ui/async-await/return-type-notation/supertrait-bound.rs
index 9c74c10b333..8d73a34ac48 100644
--- a/tests/ui/async-await/return-type-notation/supertrait-bound.rs
+++ b/tests/ui/async-await/return-type-notation/supertrait-bound.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete and may not be safe to use
 
 trait IntFactory {
     fn stream(&self) -> impl Iterator<Item = i32>;
diff --git a/tests/ui/async-await/return-type-notation/supertrait-bound.stderr b/tests/ui/async-await/return-type-notation/supertrait-bound.stderr
deleted file mode 100644
index eb6917fc7d5..00000000000
--- a/tests/ui/async-await/return-type-notation/supertrait-bound.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/supertrait-bound.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-
diff --git a/tests/ui/async-await/return-type-notation/ty-or-ct-params.rs b/tests/ui/async-await/return-type-notation/ty-or-ct-params.rs
index 06a966df445..edb92d8e265 100644
--- a/tests/ui/async-await/return-type-notation/ty-or-ct-params.rs
+++ b/tests/ui/async-await/return-type-notation/ty-or-ct-params.rs
@@ -1,7 +1,6 @@
 //@ edition: 2021
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     async fn bar<T>() {}
diff --git a/tests/ui/async-await/return-type-notation/ty-or-ct-params.stderr b/tests/ui/async-await/return-type-notation/ty-or-ct-params.stderr
index 1c000bc6c33..0e43d69bddc 100644
--- a/tests/ui/async-await/return-type-notation/ty-or-ct-params.stderr
+++ b/tests/ui/async-await/return-type-notation/ty-or-ct-params.stderr
@@ -1,14 +1,5 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/ty-or-ct-params.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: return type notation is not allowed for functions that have type parameters
-  --> $DIR/ty-or-ct-params.rs:14:12
+  --> $DIR/ty-or-ct-params.rs:13:12
    |
 LL |     async fn bar<T>() {}
    |                  - type parameter declared here
@@ -17,7 +8,7 @@ LL |     T: Foo<bar(..): Send, baz(..): Send>,
    |            ^^^^^^^^^^^^^
 
 error: return type notation is not allowed for functions that have const parameters
-  --> $DIR/ty-or-ct-params.rs:14:27
+  --> $DIR/ty-or-ct-params.rs:13:27
    |
 LL |     async fn baz<const N: usize>() {}
    |                  -------------- const parameter declared here
@@ -25,5 +16,5 @@ LL |     async fn baz<const N: usize>() {}
 LL |     T: Foo<bar(..): Send, baz(..): Send>,
    |                           ^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
diff --git a/tests/ui/borrowck/alias-liveness/rtn-static.rs b/tests/ui/borrowck/alias-liveness/rtn-static.rs
index 6aa5d8fc7a1..5b6cf5b5c7c 100644
--- a/tests/ui/borrowck/alias-liveness/rtn-static.rs
+++ b/tests/ui/borrowck/alias-liveness/rtn-static.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(return_type_notation)]
-//~^ WARN the feature `return_type_notation` is incomplete
 
 trait Foo {
     fn borrow(&mut self) -> impl Sized + '_;
diff --git a/tests/ui/borrowck/alias-liveness/rtn-static.stderr b/tests/ui/borrowck/alias-liveness/rtn-static.stderr
deleted file mode 100644
index e9202db2c79..00000000000
--- a/tests/ui/borrowck/alias-liveness/rtn-static.stderr
+++ /dev/null
@@ -1,11 +0,0 @@
-warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/rtn-static.rs:3:12
-   |
-LL | #![feature(return_type_notation)]
-   |            ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: 1 warning emitted
-