1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/bound-normalization-fail.rs b/tests/ui/impl-trait/bound-normalization-fail.rs
new file mode 100644
index 00000000000..3329592478d
--- /dev/null
+++ b/tests/ui/impl-trait/bound-normalization-fail.rs
@@ -0,0 +1,48 @@
+// edition:2018
+
+// See issue 60414
+
+// Reduction to `impl Trait`
+
+struct Foo<T>(T);
+
+trait FooLike {
+    type Output;
+}
+
+impl<T> FooLike for Foo<T> {
+    type Output = T;
+}
+
+mod impl_trait {
+    use super::*;
+
+    trait Trait {
+        type Assoc;
+    }
+
+    /// `T::Assoc` can't be normalized any further here.
+    fn foo_fail<T: Trait>() -> impl FooLike<Output = T::Assoc> {
+        //~^ ERROR: type mismatch
+        Foo(())
+    }
+}
+
+// Same with lifetimes in the trait
+
+mod lifetimes {
+    use super::*;
+
+    trait Trait<'a> {
+        type Assoc;
+    }
+
+    /// Missing bound constraining `Assoc`, `T::Assoc` can't be normalized further.
+    fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
+        //~^ ERROR `impl Trait` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
+        //~| ERROR: type mismatch
+        Foo(())
+    }
+}
+
+fn main() {}