1 files changed, 52 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/bound-normalization-fail.stderr b/src/test/ui/impl-trait/bound-normalization-fail.stderr
new file mode 100644
index 000000000..bd8d3d3d2
--- /dev/null
+++ b/src/test/ui/impl-trait/bound-normalization-fail.stderr
@@ -0,0 +1,52 @@
+error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc`
+  --> $DIR/bound-normalization-fail.rs:25:32
+   |
+LL |     fn foo_fail<T: Trait>() -> impl FooLike<Output = T::Assoc> {
+   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `<Foo<()> as FooLike>::Output == <T as impl_trait::Trait>::Assoc`
+LL |
+LL |         Foo(())
+   |         ------- return type was inferred to be `Foo<()>` here
+   |
+note: expected this to be `()`
+  --> $DIR/bound-normalization-fail.rs:14:19
+   |
+LL |     type Output = T;
+   |                   ^
+   = note:    expected unit type `()`
+           found associated type `<T as impl_trait::Trait>::Assoc`
+help: consider constraining the associated type `<T as impl_trait::Trait>::Assoc` to `()`
+   |
+LL |     fn foo_fail<T: Trait<Assoc = ()>>() -> impl FooLike<Output = T::Assoc> {
+   |                         ++++++++++++
+
+error[E0760]: `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
+  --> $DIR/bound-normalization-fail.rs:41:41
+   |
+LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
+   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc`
+  --> $DIR/bound-normalization-fail.rs:41:41
+   |
+LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
+   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `<Foo<()> as FooLike>::Output == <T as lifetimes::Trait<'static>>::Assoc`
+...
+LL |         Foo(())
+   |         ------- return type was inferred to be `Foo<()>` here
+   |
+note: expected this to be `()`
+  --> $DIR/bound-normalization-fail.rs:14:19
+   |
+LL |     type Output = T;
+   |                   ^
+   = note:    expected unit type `()`
+           found associated type `<T as lifetimes::Trait<'static>>::Assoc`
+help: consider constraining the associated type `<T as lifetimes::Trait<'static>>::Assoc` to `()`
+   |
+LL |     fn foo2_fail<'a, T: Trait<'a, Assoc = ()>>() -> impl FooLike<Output = T::Assoc> {
+   |                                 ++++++++++++
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0271, E0760.
+For more information about an error, try `rustc --explain E0271`.