diff --git a/compiler/rustc_infer/src/infer/relate/equate.rs b/compiler/rustc_infer/src/infer/relate/equate.rs
index 0087add4c72..aefa9a5a0d6 100644
--- a/compiler/rustc_infer/src/infer/relate/equate.rs
+++ b/compiler/rustc_infer/src/infer/relate/equate.rs
@@ -90,6 +90,11 @@ fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
                 infcx.instantiate_ty_var(self, !self.a_is_expected, b_vid, ty::Invariant, a)?;
             }
 
+            (&ty::Error(e), _) | (_, &ty::Error(e)) => {
+                infcx.set_tainted_by_errors(e);
+                return Ok(Ty::new_error(self.tcx(), e));
+            }
+
             (
                 &ty::Alias(ty::Opaque, ty::AliasTy { def_id: a_def_id, .. }),
                 &ty::Alias(ty::Opaque, ty::AliasTy { def_id: b_def_id, .. }),
diff --git a/tests/ui/generic-associated-types/issue-79636-1.rs b/tests/ui/generic-associated-types/issue-79636-1.rs
index a05311d59c1..3357afb9d4d 100644
--- a/tests/ui/generic-associated-types/issue-79636-1.rs
+++ b/tests/ui/generic-associated-types/issue-79636-1.rs
@@ -15,7 +15,6 @@ fn join<MOuter, MInner, A>(outer: MOuter) -> MOuter::Wrapped<A>
     //~^ ERROR: missing generics for associated type `Monad::Wrapped`
 {
     outer.bind(|inner| inner)
-    //~^ ERROR type annotations needed
 }
 
 fn main() {
diff --git a/tests/ui/generic-associated-types/issue-79636-1.stderr b/tests/ui/generic-associated-types/issue-79636-1.stderr
index 743d8b7d462..c31064dec62 100644
--- a/tests/ui/generic-associated-types/issue-79636-1.stderr
+++ b/tests/ui/generic-associated-types/issue-79636-1.stderr
@@ -30,19 +30,8 @@ help: function arguments must have a statically known size, borrowed types alway
 LL |     fn bind<B, F>(&self, f: F) -> Self::Wrapped<B> {
    |                   +
 
-error[E0282]: type annotations needed
-  --> $DIR/issue-79636-1.rs:17:17
-   |
-LL |     outer.bind(|inner| inner)
-   |                 ^^^^^
-   |
-help: consider giving this closure parameter an explicit type
-   |
-LL |     outer.bind(|inner: /* Type */| inner)
-   |                      ++++++++++++
-
 error[E0277]: the trait bound `Option<Option<bool>>: Monad` is not satisfied
-  --> $DIR/issue-79636-1.rs:22:21
+  --> $DIR/issue-79636-1.rs:21:21
    |
 LL |     assert_eq!(join(Some(Some(true))), Some(true));
    |                ---- ^^^^^^^^^^^^^^^^ the trait `Monad` is not implemented for `Option<Option<bool>>`
@@ -63,7 +52,7 @@ LL | where
 LL |     MOuter: Monad<Unwrapped = MInner>,
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `join`
 
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0107, E0277, E0282.
+Some errors have detailed explanations: E0107, E0277.
 For more information about an error, try `rustc --explain E0107`.
diff --git a/tests/ui/impl-trait/where-allowed.rs b/tests/ui/impl-trait/where-allowed.rs
index 505e2d6c171..72ce617693e 100644
--- a/tests/ui/impl-trait/where-allowed.rs
+++ b/tests/ui/impl-trait/where-allowed.rs
@@ -59,7 +59,6 @@ fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
 fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
 //~^ ERROR `impl Trait` is not allowed in the parameters of `Fn` trait bounds
 //~| ERROR nested `impl Trait` is not allowed
-//~| ERROR: type annotations needed
 
 // Allowed
 fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }
diff --git a/tests/ui/impl-trait/where-allowed.stderr b/tests/ui/impl-trait/where-allowed.stderr
index c22312cce19..f203f4cabc8 100644
--- a/tests/ui/impl-trait/where-allowed.stderr
+++ b/tests/ui/impl-trait/where-allowed.stderr
@@ -17,7 +17,7 @@ LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic
    |                                                 outer `impl Trait`
 
 error[E0658]: `impl Trait` in associated types is unstable
-  --> $DIR/where-allowed.rs:123:16
+  --> $DIR/where-allowed.rs:122:16
    |
 LL |     type Out = impl Debug;
    |                ^^^^^^^^^^
@@ -27,7 +27,7 @@ LL |     type Out = impl Debug;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/where-allowed.rs:160:23
+  --> $DIR/where-allowed.rs:159:23
    |
 LL | type InTypeAlias<R> = impl Debug;
    |                       ^^^^^^^^^^
@@ -37,7 +37,7 @@ LL | type InTypeAlias<R> = impl Debug;
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0658]: `impl Trait` in type aliases is unstable
-  --> $DIR/where-allowed.rs:163:39
+  --> $DIR/where-allowed.rs:162:39
    |
 LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
    |                                       ^^^^^^^^^^
@@ -127,7 +127,7 @@ LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in the parameters of `Fn` trait bounds
-  --> $DIR/where-allowed.rs:69:38
+  --> $DIR/where-allowed.rs:68:38
    |
 LL | fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
    |                                      ^^^^^^^^^^
@@ -135,7 +135,7 @@ LL | fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in the return type of `Fn` trait bounds
-  --> $DIR/where-allowed.rs:73:40
+  --> $DIR/where-allowed.rs:72:40
    |
 LL | fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
    |                                        ^^^^^^^^^^
@@ -143,7 +143,7 @@ LL | fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in field types
-  --> $DIR/where-allowed.rs:87:32
+  --> $DIR/where-allowed.rs:86:32
    |
 LL | struct InBraceStructField { x: impl Debug }
    |                                ^^^^^^^^^^
@@ -151,7 +151,7 @@ LL | struct InBraceStructField { x: impl Debug }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in field types
-  --> $DIR/where-allowed.rs:91:41
+  --> $DIR/where-allowed.rs:90:41
    |
 LL | struct InAdtInBraceStructField { x: Vec<impl Debug> }
    |                                         ^^^^^^^^^^
@@ -159,7 +159,7 @@ LL | struct InAdtInBraceStructField { x: Vec<impl Debug> }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in field types
-  --> $DIR/where-allowed.rs:95:27
+  --> $DIR/where-allowed.rs:94:27
    |
 LL | struct InTupleStructField(impl Debug);
    |                           ^^^^^^^^^^
@@ -167,7 +167,7 @@ LL | struct InTupleStructField(impl Debug);
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in field types
-  --> $DIR/where-allowed.rs:100:25
+  --> $DIR/where-allowed.rs:99:25
    |
 LL |     InBraceVariant { x: impl Debug },
    |                         ^^^^^^^^^^
@@ -175,7 +175,7 @@ LL |     InBraceVariant { x: impl Debug },
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in field types
-  --> $DIR/where-allowed.rs:102:20
+  --> $DIR/where-allowed.rs:101:20
    |
 LL |     InTupleVariant(impl Debug),
    |                    ^^^^^^^^^^
@@ -183,7 +183,7 @@ LL |     InTupleVariant(impl Debug),
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in `extern fn` parameters
-  --> $DIR/where-allowed.rs:144:33
+  --> $DIR/where-allowed.rs:143:33
    |
 LL |     fn in_foreign_parameters(_: impl Debug);
    |                                 ^^^^^^^^^^
@@ -191,7 +191,7 @@ LL |     fn in_foreign_parameters(_: impl Debug);
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in `extern fn` return types
-  --> $DIR/where-allowed.rs:147:31
+  --> $DIR/where-allowed.rs:146:31
    |
 LL |     fn in_foreign_return() -> impl Debug;
    |                               ^^^^^^^^^^
@@ -199,7 +199,7 @@ LL |     fn in_foreign_return() -> impl Debug;
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in `fn` pointer return types
-  --> $DIR/where-allowed.rs:163:39
+  --> $DIR/where-allowed.rs:162:39
    |
 LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
    |                                       ^^^^^^^^^^
@@ -207,7 +207,7 @@ LL | type InReturnInTypeAlias<R> = fn() -> impl Debug;
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in traits
-  --> $DIR/where-allowed.rs:168:16
+  --> $DIR/where-allowed.rs:167:16
    |
 LL | impl PartialEq<impl Debug> for () {
    |                ^^^^^^^^^^
@@ -215,7 +215,7 @@ LL | impl PartialEq<impl Debug> for () {
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in impl headers
-  --> $DIR/where-allowed.rs:173:24
+  --> $DIR/where-allowed.rs:172:24
    |
 LL | impl PartialEq<()> for impl Debug {
    |                        ^^^^^^^^^^
@@ -223,7 +223,7 @@ LL | impl PartialEq<()> for impl Debug {
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in impl headers
-  --> $DIR/where-allowed.rs:178:6
+  --> $DIR/where-allowed.rs:177:6
    |
 LL | impl impl Debug {
    |      ^^^^^^^^^^
@@ -231,7 +231,7 @@ LL | impl impl Debug {
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in impl headers
-  --> $DIR/where-allowed.rs:184:24
+  --> $DIR/where-allowed.rs:183:24
    |
 LL | impl InInherentImplAdt<impl Debug> {
    |                        ^^^^^^^^^^
@@ -239,7 +239,7 @@ LL | impl InInherentImplAdt<impl Debug> {
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in bounds
-  --> $DIR/where-allowed.rs:190:11
+  --> $DIR/where-allowed.rs:189:11
    |
 LL |     where impl Debug: Debug
    |           ^^^^^^^^^^
@@ -247,7 +247,7 @@ LL |     where impl Debug: Debug
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in bounds
-  --> $DIR/where-allowed.rs:197:15
+  --> $DIR/where-allowed.rs:196:15
    |
 LL |     where Vec<impl Debug>: Debug
    |               ^^^^^^^^^^
@@ -255,7 +255,7 @@ LL |     where Vec<impl Debug>: Debug
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in bounds
-  --> $DIR/where-allowed.rs:204:24
+  --> $DIR/where-allowed.rs:203:24
    |
 LL |     where T: PartialEq<impl Debug>
    |                        ^^^^^^^^^^
@@ -263,7 +263,7 @@ LL |     where T: PartialEq<impl Debug>
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in the parameters of `Fn` trait bounds
-  --> $DIR/where-allowed.rs:211:17
+  --> $DIR/where-allowed.rs:210:17
    |
 LL |     where T: Fn(impl Debug)
    |                 ^^^^^^^^^^
@@ -271,7 +271,7 @@ LL |     where T: Fn(impl Debug)
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in the return type of `Fn` trait bounds
-  --> $DIR/where-allowed.rs:218:22
+  --> $DIR/where-allowed.rs:217:22
    |
 LL |     where T: Fn() -> impl Debug
    |                      ^^^^^^^^^^
@@ -279,7 +279,7 @@ LL |     where T: Fn() -> impl Debug
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:224:40
+  --> $DIR/where-allowed.rs:223:40
    |
 LL | struct InStructGenericParamDefault<T = impl Debug>(T);
    |                                        ^^^^^^^^^^
@@ -287,7 +287,7 @@ LL | struct InStructGenericParamDefault<T = impl Debug>(T);
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:228:36
+  --> $DIR/where-allowed.rs:227:36
    |
 LL | enum InEnumGenericParamDefault<T = impl Debug> { Variant(T) }
    |                                    ^^^^^^^^^^
@@ -295,7 +295,7 @@ LL | enum InEnumGenericParamDefault<T = impl Debug> { Variant(T) }
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:232:38
+  --> $DIR/where-allowed.rs:231:38
    |
 LL | trait InTraitGenericParamDefault<T = impl Debug> {}
    |                                      ^^^^^^^^^^
@@ -303,7 +303,7 @@ LL | trait InTraitGenericParamDefault<T = impl Debug> {}
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:236:41
+  --> $DIR/where-allowed.rs:235:41
    |
 LL | type InTypeAliasGenericParamDefault<T = impl Debug> = T;
    |                                         ^^^^^^^^^^
@@ -311,7 +311,7 @@ LL | type InTypeAliasGenericParamDefault<T = impl Debug> = T;
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:240:11
+  --> $DIR/where-allowed.rs:239:11
    |
 LL | impl <T = impl Debug> T {}
    |           ^^^^^^^^^^
@@ -319,7 +319,7 @@ LL | impl <T = impl Debug> T {}
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in generic parameter defaults
-  --> $DIR/where-allowed.rs:247:40
+  --> $DIR/where-allowed.rs:246:40
    |
 LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
    |                                        ^^^^^^^^^^
@@ -327,7 +327,7 @@ LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in the type of variable bindings
-  --> $DIR/where-allowed.rs:253:29
+  --> $DIR/where-allowed.rs:252:29
    |
 LL |     let _in_local_variable: impl Fn() = || {};
    |                             ^^^^^^^^^
@@ -335,7 +335,7 @@ LL |     let _in_local_variable: impl Fn() = || {};
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error[E0562]: `impl Trait` is not allowed in closure return types
-  --> $DIR/where-allowed.rs:255:46
+  --> $DIR/where-allowed.rs:254:46
    |
 LL |     let _in_return_in_local_variable = || -> impl Fn() { || {} };
    |                                              ^^^^^^^^^
@@ -343,7 +343,7 @@ LL |     let _in_return_in_local_variable = || -> impl Fn() { || {} };
    = note: `impl Trait` is only allowed in arguments and return types of functions and methods
 
 error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
-  --> $DIR/where-allowed.rs:240:7
+  --> $DIR/where-allowed.rs:239:7
    |
 LL | impl <T = impl Debug> T {}
    |       ^^^^^^^^^^^^^^
@@ -353,7 +353,7 @@ LL | impl <T = impl Debug> T {}
    = note: `#[deny(invalid_type_param_default)]` on by default
 
 error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
-  --> $DIR/where-allowed.rs:247:36
+  --> $DIR/where-allowed.rs:246:36
    |
 LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
    |                                    ^^^^^^^^^^^^^^
@@ -362,7 +362,7 @@ LL | fn in_method_generic_param_default<T = impl Debug>(_: T) {}
    = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>
 
 error[E0118]: no nominal type found for inherent implementation
-  --> $DIR/where-allowed.rs:240:1
+  --> $DIR/where-allowed.rs:239:1
    |
 LL | impl <T = impl Debug> T {}
    | ^^^^^^^^^^^^^^^^^^^^^^^ impl requires a nominal type
@@ -377,14 +377,8 @@ LL | fn in_dyn_Fn_return_in_return() -> &'static dyn Fn() -> impl Debug { panic!
    |
    = note: cannot satisfy `_: Debug`
 
-error[E0282]: type annotations needed
-  --> $DIR/where-allowed.rs:59:49
-   |
-LL | fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
-   |                                                 ^^^^^^^^^^^^^^^^^^^ cannot infer type
-
 error[E0283]: type annotations needed
-  --> $DIR/where-allowed.rs:65:46
+  --> $DIR/where-allowed.rs:64:46
    |
 LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }
    |                                              ^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
@@ -396,7 +390,7 @@ LL | fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { pani
              where Args: Tuple, F: Fn<Args>, A: Allocator, F: ?Sized;
 
 error[E0599]: no function or associated item named `into_vec` found for slice `[_]` in the current scope
-  --> $DIR/where-allowed.rs:82:5
+  --> $DIR/where-allowed.rs:81:5
    |
 LL |     vec![vec![0; 10], vec![12; 7], vec![8; 3]]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function or associated item not found in `[_]`
@@ -404,7 +398,7 @@ LL |     vec![vec![0; 10], vec![12; 7], vec![8; 3]]
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0053]: method `in_trait_impl_return` has an incompatible type for trait
-  --> $DIR/where-allowed.rs:130:34
+  --> $DIR/where-allowed.rs:129:34
    |
 LL |     type Out = impl Debug;
    |                ---------- the expected opaque type
@@ -416,7 +410,7 @@ LL |     fn in_trait_impl_return() -> impl Debug { () }
    |                                  help: change the output type to match the trait: `<() as DummyTrait>::Out`
    |
 note: type in trait
-  --> $DIR/where-allowed.rs:120:34
+  --> $DIR/where-allowed.rs:119:34
    |
 LL |     fn in_trait_impl_return() -> Self::Out;
    |                                  ^^^^^^^^^
@@ -425,14 +419,14 @@ LL |     fn in_trait_impl_return() -> Self::Out;
    = note: distinct uses of `impl Trait` result in different opaque types
 
 error: unconstrained opaque type
-  --> $DIR/where-allowed.rs:123:16
+  --> $DIR/where-allowed.rs:122:16
    |
 LL |     type Out = impl Debug;
    |                ^^^^^^^^^^
    |
    = note: `Out` must be used in combination with a concrete type within the same impl
 
-error: aborting due to 51 previous errors
+error: aborting due to 50 previous errors
 
-Some errors have detailed explanations: E0053, E0118, E0282, E0283, E0562, E0599, E0658, E0666.
+Some errors have detailed explanations: E0053, E0118, E0283, E0562, E0599, E0658, E0666.
 For more information about an error, try `rustc --explain E0053`.
diff --git a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs
index a3f65146f75..71416eb531a 100644
--- a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs
+++ b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.rs
@@ -18,7 +18,6 @@ impl Foo for () {
 
     type Baz<T> = impl Sized;
     //~^ ERROR type `Baz` has 1 type parameter but its trait declaration has 0 type parameters
-    //~| ERROR unconstrained opaque type
 
     fn test<'a>() -> Self::Bar<'a> {
         &()
diff --git a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr
index 13f5d8b8ea6..e5a21ff8b4e 100644
--- a/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr
+++ b/tests/ui/type-alias-impl-trait/impl-trait-in-type-alias-with-bad-substs.stderr
@@ -7,14 +7,6 @@ LL |     type Baz<'a>;
 LL |     type Baz<T> = impl Sized;
    |              ^ found 1 type parameter
 
-error: unconstrained opaque type
-  --> $DIR/impl-trait-in-type-alias-with-bad-substs.rs:19:19
-   |
-LL |     type Baz<T> = impl Sized;
-   |                   ^^^^^^^^^^
-   |
-   = note: `Baz` must be used in combination with a concrete type within the same impl
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0049`.
diff --git a/tests/ui/wf/issue-110157.rs b/tests/ui/wf/issue-110157.rs
index 07e2c5d58c3..1a3d13e93b0 100644
--- a/tests/ui/wf/issue-110157.rs
+++ b/tests/ui/wf/issue-110157.rs
@@ -1,8 +1,7 @@
 struct NeedsDropTypes<'tcx, F>(std::marker::PhantomData<&'tcx F>);
 
 impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F>
-//~^ ERROR type annotations needed
-//~| ERROR not all trait items implemented
+//~^ ERROR not all trait items implemented
 where
     F: Fn(&Missing) -> Result<I, ()>,
     //~^ ERROR cannot find type `Missing` in this scope
diff --git a/tests/ui/wf/issue-110157.stderr b/tests/ui/wf/issue-110157.stderr
index 16bd34a6d8e..e750ea47d51 100644
--- a/tests/ui/wf/issue-110157.stderr
+++ b/tests/ui/wf/issue-110157.stderr
@@ -1,37 +1,20 @@
 error[E0412]: cannot find type `Missing` in this scope
-  --> $DIR/issue-110157.rs:7:12
+  --> $DIR/issue-110157.rs:6:12
    |
 LL |     F: Fn(&Missing) -> Result<I, ()>,
    |            ^^^^^^^ not found in this scope
 
 error[E0412]: cannot find type `Missing` in this scope
-  --> $DIR/issue-110157.rs:9:24
+  --> $DIR/issue-110157.rs:8:24
    |
 LL |     I: Iterator<Item = Missing>,
    |                        ^^^^^^^ not found in this scope
 
-error[E0283]: type annotations needed
-  --> $DIR/issue-110157.rs:3:31
-   |
-LL | impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F>
-   |                               ^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `I`
-   |
-   = note: cannot satisfy `_: Iterator`
-note: required for `NeedsDropTypes<'tcx, F>` to implement `Iterator`
-  --> $DIR/issue-110157.rs:3:18
-   |
-LL | impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F>
-   |                  ^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^
-...
-LL |     I: Iterator<Item = Missing>,
-   |        ------------------------ unsatisfied trait bound introduced here
-
 error[E0046]: not all trait items implemented, missing: `Item`, `next`
   --> $DIR/issue-110157.rs:3:1
    |
 LL | / impl<'tcx, F, I> Iterator for NeedsDropTypes<'tcx, F>
 LL | |
-LL | |
 LL | | where
 LL | |     F: Fn(&Missing) -> Result<I, ()>,
 LL | |
@@ -41,7 +24,7 @@ LL | |     I: Iterator<Item = Missing>,
    = help: implement the missing item: `type Item = /* Type */;`
    = help: implement the missing item: `fn next(&mut self) -> Option<<Self as Iterator>::Item> { todo!() }`
 
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0046, E0283, E0412.
+Some errors have detailed explanations: E0046, E0412.
 For more information about an error, try `rustc --explain E0046`.