1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs b/tests/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs
new file mode 100644
index 00000000000..2e53a00a90e
--- /dev/null
+++ b/tests/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs
@@ -0,0 +1,21 @@
+// check-fail
+#![feature(trait_upcasting)]
+
+trait Bar<T> {
+    fn bar(&self, _: T) {}
+}
+
+trait Foo: Bar<i32> + Bar<u32> {
+    fn foo(&self, _: ()) {}
+}
+
+struct S;
+
+impl Bar<i32> for S {}
+impl Bar<u32> for S {}
+impl Foo for S {}
+
+fn main() {
+    let s: &dyn Foo = &S;
+    let t: &dyn Bar<_> = s; //~ ERROR mismatched types
+}