1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/coherence/coherence-overlap-downstream.rs b/tests/ui/coherence/coherence-overlap-downstream.rs
new file mode 100644
index 00000000000..738ec0e3d45
--- /dev/null
+++ b/tests/ui/coherence/coherence-overlap-downstream.rs
@@ -0,0 +1,17 @@
+// Tests that we consider `T: Sugar + Fruit` to be ambiguous, even
+// though no impls are found.
+
+pub trait Sugar {}
+pub trait Fruit {}
+pub trait Sweet {}
+impl<T:Sugar> Sweet for T { }
+impl<T:Fruit> Sweet for T { }
+//~^ ERROR E0119
+
+pub trait Foo<X> {}
+pub trait Bar<X> {}
+impl<X, T> Foo<X> for T where T: Bar<X> {}
+impl<X> Foo<X> for i32 {}
+//~^ ERROR E0119
+
+fn main() { }