diff --git a/src/test/ui/rfc1598-generic-associated-types/collections.rs b/src/test/ui/rfc1598-generic-associated-types/collections.rs
index e71166ed65bba..a6dbb03d379db 100644
--- a/src/test/ui/rfc1598-generic-associated-types/collections.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/collections.rs
@@ -9,10 +9,11 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 #![feature(associated_type_defaults)]
 
-//FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
-//follow-up PR
+// FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
+// follow-up PR.
 
 // A Collection trait and collection families. Based on
 // http://smallcultfollowing.com/babysteps/blog/2016/11/03/
diff --git a/src/test/ui/rfc1598-generic-associated-types/collections.stderr b/src/test/ui/rfc1598-generic-associated-types/collections.stderr
index 8c31ab2ca88e4..0e7d6ace1bb1d 100644
--- a/src/test/ui/rfc1598-generic-associated-types/collections.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/collections.stderr
@@ -1,29 +1,35 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/collections.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/collections.rs:65:90
+  --> $DIR/collections.rs:66:90
    |
 LL | fn floatify<C>(ints: &C) -> <<C as Collection<i32>>::Family as CollectionFamily>::Member<f32>
    |                                                                                          ^^^ type parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/collections.rs:77:69
+  --> $DIR/collections.rs:78:69
    |
 LL | fn floatify_sibling<C>(ints: &C) -> <C as Collection<i32>>::Sibling<f32>
    |                                                                     ^^^ type parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/collections.rs:26:71
+  --> $DIR/collections.rs:27:71
    |
 LL |         <<Self as Collection<T>>::Family as CollectionFamily>::Member<U>;
    |                                                                       ^ type parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/collections.rs:33:50
+  --> $DIR/collections.rs:34:50
    |
 LL |     fn iterate<'iter>(&'iter self) -> Self::Iter<'iter>;
    |                                                  ^^^^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/collections.rs:59:50
+  --> $DIR/collections.rs:60:50
    |
 LL |     fn iterate<'iter>(&'iter self) -> Self::Iter<'iter> {
    |                                                  ^^^^^ lifetime parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.rs b/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.rs
index 0429410031526..88a660b3a5afe 100644
--- a/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.rs
@@ -9,11 +9,12 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
 use std::ops::Deref;
 
-//FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
-//follow-up PR
+// FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
+// follow-up PR.
 
 trait Foo {
     type Bar<'a, 'b>;
diff --git a/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.stderr b/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.stderr
index 1746122eb49f4..5c85698fa55c7 100644
--- a/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/construct_with_other_type.stderr
@@ -1,17 +1,23 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/construct_with_other_type.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/construct_with_other_type.rs:26:46
+  --> $DIR/construct_with_other_type.rs:27:46
    |
 LL |     type Baa<'a>: Deref<Target = <Self::Quux<'a> as Foo>::Bar<'a, 'static>>;
    |                                              ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/construct_with_other_type.rs:26:63
+  --> $DIR/construct_with_other_type.rs:27:63
    |
 LL |     type Baa<'a>: Deref<Target = <Self::Quux<'a> as Foo>::Bar<'a, 'static>>;
    |                                                               ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/construct_with_other_type.rs:34:40
+  --> $DIR/construct_with_other_type.rs:35:40
    |
 LL |     type Baa<'a> = &'a <T as Foo>::Bar<'a, 'static>;
    |                                        ^^ lifetime parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/empty_generics.rs b/src/test/ui/rfc1598-generic-associated-types/empty_generics.rs
index b12c075d13291..d8a2a1b73f7ef 100644
--- a/src/test/ui/rfc1598-generic-associated-types/empty_generics.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/empty_generics.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
 trait Foo {
     type Bar<,>;
diff --git a/src/test/ui/rfc1598-generic-associated-types/empty_generics.stderr b/src/test/ui/rfc1598-generic-associated-types/empty_generics.stderr
index aff3044e9a14d..2670c3aa142b2 100644
--- a/src/test/ui/rfc1598-generic-associated-types/empty_generics.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/empty_generics.stderr
@@ -1,8 +1,14 @@
 error: expected one of `>`, identifier, or lifetime, found `,`
-  --> $DIR/empty_generics.rs:14:14
+  --> $DIR/empty_generics.rs:15:14
    |
 LL |     type Bar<,>;
    |              ^ expected one of `>`, identifier, or lifetime here
 
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/empty_generics.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: aborting due to previous error
 
diff --git a/src/test/ui/rfc1598-generic-associated-types/generic-associated-types-where.stderr b/src/test/ui/rfc1598-generic-associated-types/generic-associated-types-where.stderr
new file mode 100644
index 0000000000000..97d5482735f86
--- /dev/null
+++ b/src/test/ui/rfc1598-generic-associated-types/generic-associated-types-where.stderr
@@ -0,0 +1,6 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/generic-associated-types-where.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
diff --git a/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.rs b/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.rs
index 263b3cb42eb4f..267272ded8c06 100644
--- a/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.rs
@@ -9,11 +9,12 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
 use std::ops::Deref;
 
-//FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
-//follow-up PR
+// FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
+// follow-up PR.
 
 trait Iterable {
     type Item<'a>;
diff --git a/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.stderr b/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.stderr
index d48c21477b310..79b29902ccdf0 100644
--- a/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/generic_associated_type_undeclared_lifetimes.stderr
@@ -1,29 +1,35 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0261]: use of undeclared lifetime name `'b`
-  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:22:37
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:23:37
    |
 LL |         + Deref<Target = Self::Item<'b>>;
    |                                     ^^ undeclared lifetime
 
 error[E0261]: use of undeclared lifetime name `'undeclared`
-  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:26:41
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:27:41
    |
 LL |     fn iter<'a>(&'a self) -> Self::Iter<'undeclared>;
    |                                         ^^^^^^^^^^^ undeclared lifetime
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:20:47
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:21:47
    |
 LL |     type Iter<'a>: Iterator<Item = Self::Item<'a>>
    |                                               ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:22:37
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:23:37
    |
 LL |         + Deref<Target = Self::Item<'b>>;
    |                                     ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:26:41
+  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:27:41
    |
 LL |     fn iter<'a>(&'a self) -> Self::Iter<'undeclared>;
    |                                         ^^^^^^^^^^^ lifetime parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/iterable.rs b/src/test/ui/rfc1598-generic-associated-types/iterable.rs
index 38967dbbe4530..b52b6e024219a 100644
--- a/src/test/ui/rfc1598-generic-associated-types/iterable.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/iterable.rs
@@ -9,11 +9,12 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
 use std::ops::Deref;
 
-//FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
-//follow-up PR
+// FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
+// follow-up PR.
 
 trait Iterable {
     type Item<'a>;
diff --git a/src/test/ui/rfc1598-generic-associated-types/iterable.stderr b/src/test/ui/rfc1598-generic-associated-types/iterable.stderr
index 737a29ec2c8be..de3563c14eb7c 100644
--- a/src/test/ui/rfc1598-generic-associated-types/iterable.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/iterable.stderr
@@ -1,35 +1,41 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/iterable.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:20:47
+  --> $DIR/iterable.rs:21:47
    |
 LL |     type Iter<'a>: Iterator<Item = Self::Item<'a>>;
    |                                               ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:49:53
+  --> $DIR/iterable.rs:50:53
    |
 LL | fn make_iter<'a, I: Iterable>(it: &'a I) -> I::Iter<'a> {
    |                                                     ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:54:60
+  --> $DIR/iterable.rs:55:60
    |
 LL | fn get_first<'a, I: Iterable>(it: &'a I) -> Option<I::Item<'a>> {
    |                                                            ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:23:41
+  --> $DIR/iterable.rs:24:41
    |
 LL |     fn iter<'a>(&'a self) -> Self::Iter<'a>;
    |                                         ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:32:41
+  --> $DIR/iterable.rs:33:41
    |
 LL |     fn iter<'a>(&'a self) -> Self::Iter<'a> {
    |                                         ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/iterable.rs:43:41
+  --> $DIR/iterable.rs:44:41
    |
 LL |     fn iter<'a>(&'a self) -> Self::Iter<'a> {
    |                                         ^^ lifetime parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.rs b/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.rs
index 51527d4117c2c..82e82e6dbccaf 100644
--- a/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.rs
@@ -9,12 +9,13 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 #![feature(associated_type_defaults)]
 
-//FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
-//follow-up PR
+// FIXME(#44265): "lifetime parameters are not allowed on this type" errors will be addressed in a
+// follow-up PR.
 
-//FIXME(#44265): Update expected errors once E110 is resolved, now does not get past `trait Foo`
+// FIXME(#44265): Update expected errors once E110 is resolved, now does not get past `trait Foo`.
 
 trait Foo {
     type A<'a>;
diff --git a/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.stderr b/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.stderr
index c8d37a51fa96b..e47daf2ae1bba 100644
--- a/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/parameter_number_and_kind.stderr
@@ -1,29 +1,35 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/parameter_number_and_kind.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/parameter_number_and_kind.rs:26:27
+  --> $DIR/parameter_number_and_kind.rs:27:27
    |
 LL |     type FOk<T> = Self::E<'static, T>;
    |                           ^^^^^^^ lifetime parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/parameter_number_and_kind.rs:26:36
+  --> $DIR/parameter_number_and_kind.rs:27:36
    |
 LL |     type FOk<T> = Self::E<'static, T>;
    |                                    ^ type parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/parameter_number_and_kind.rs:29:26
+  --> $DIR/parameter_number_and_kind.rs:30:26
    |
 LL |     type FErr1 = Self::E<'static, 'static>; // Error
    |                          ^^^^^^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/parameter_number_and_kind.rs:31:29
+  --> $DIR/parameter_number_and_kind.rs:32:29
    |
 LL |     type FErr2<T> = Self::E<'static, T, u32>; // Error
    |                             ^^^^^^^ lifetime parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/parameter_number_and_kind.rs:31:38
+  --> $DIR/parameter_number_and_kind.rs:32:38
    |
 LL |     type FErr2<T> = Self::E<'static, T, u32>; // Error
    |                                      ^ type parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/pointer_family.rs b/src/test/ui/rfc1598-generic-associated-types/pointer_family.rs
index cbeeb1d6ca7b2..0300ad06194e7 100644
--- a/src/test/ui/rfc1598-generic-associated-types/pointer_family.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/pointer_family.rs
@@ -9,8 +9,9 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
-//FIXME(#44265): "type parameter not allowed" errors will be addressed in a follow-up PR
+// FIXME(#44265): "type parameter not allowed" errors will be addressed in a follow-up PR.
 
 use std::rc::Rc;
 use std::sync::Arc;
diff --git a/src/test/ui/rfc1598-generic-associated-types/pointer_family.stderr b/src/test/ui/rfc1598-generic-associated-types/pointer_family.stderr
index 3e772eee4f492..3be0481dc67e8 100644
--- a/src/test/ui/rfc1598-generic-associated-types/pointer_family.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/pointer_family.stderr
@@ -1,23 +1,29 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/pointer_family.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/pointer_family.rs:46:21
+  --> $DIR/pointer_family.rs:47:21
    |
 LL |     bar: P::Pointer<String>,
    |                     ^^^^^^ type parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/pointer_family.rs:21:42
+  --> $DIR/pointer_family.rs:22:42
    |
 LL |     fn new<T>(value: T) -> Self::Pointer<T>;
    |                                          ^ type parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/pointer_family.rs:29:42
+  --> $DIR/pointer_family.rs:30:42
    |
 LL |     fn new<T>(value: T) -> Self::Pointer<T> {
    |                                          ^ type parameter not allowed
 
 error[E0109]: type parameters are not allowed on this type
-  --> $DIR/pointer_family.rs:39:42
+  --> $DIR/pointer_family.rs:40:42
    |
 LL |     fn new<T>(value: T) -> Self::Pointer<T> {
    |                                          ^ type parameter not allowed
diff --git a/src/test/ui/rfc1598-generic-associated-types/shadowing.stderr b/src/test/ui/rfc1598-generic-associated-types/shadowing.stderr
new file mode 100644
index 0000000000000..f2d626f921c89
--- /dev/null
+++ b/src/test/ui/rfc1598-generic-associated-types/shadowing.stderr
@@ -0,0 +1,6 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/shadowing.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
diff --git a/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.rs b/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.rs
index 522ddb5dc135e..aa90886fdfd65 100644
--- a/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.rs
+++ b/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.rs
@@ -9,8 +9,9 @@
 // except according to those terms.
 
 #![feature(generic_associated_types)]
+//~^ WARNING the feature `generic_associated_types` is incomplete
 
-//FIXME(#44265): "lifetime parameter not allowed on this type" errors will be addressed in a
+// FIXME(#44265): "lifetime parameter not allowed on this type" errors will be addressed in a
 // follow-up PR
 
 use std::fmt::Display;
diff --git a/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.stderr b/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.stderr
index 12e206cbd476a..4aca8d476877b 100644
--- a/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.stderr
+++ b/src/test/ui/rfc1598-generic-associated-types/streaming_iterator.stderr
@@ -1,29 +1,35 @@
+warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
+  --> $DIR/streaming_iterator.rs:11:12
+   |
+LL | #![feature(generic_associated_types)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^
+
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/streaming_iterator.rs:27:41
+  --> $DIR/streaming_iterator.rs:28:41
    |
 LL |     bar: <T as StreamingIterator>::Item<'static>,
    |                                         ^^^^^^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/streaming_iterator.rs:35:64
+  --> $DIR/streaming_iterator.rs:36:64
    |
 LL | fn foo<T>(iter: T) where T: StreamingIterator, for<'a> T::Item<'a>: Display { /* ... */ }
    |                                                                ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/streaming_iterator.rs:21:48
+  --> $DIR/streaming_iterator.rs:22:48
    |
 LL |     fn next<'a>(&'a self) -> Option<Self::Item<'a>>;
    |                                                ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/streaming_iterator.rs:47:37
+  --> $DIR/streaming_iterator.rs:48:37
    |
 LL |     type Item<'a> = (usize, I::Item<'a>);
    |                                     ^^ lifetime parameter not allowed
 
 error[E0110]: lifetime parameters are not allowed on this type
-  --> $DIR/streaming_iterator.rs:49:48
+  --> $DIR/streaming_iterator.rs:50:48
    |
 LL |     fn next<'a>(&'a self) -> Option<Self::Item<'a>> {
    |                                                ^^ lifetime parameter not allowed