1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs b/src/test/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs
new file mode 100644
index 000000000..6986ad621
--- /dev/null
+++ b/src/test/ui/traits/trait-upcasting/multiple-occurrence-ambiguousity.rs
@@ -0,0 +1,22 @@
+// check-fail
+#![feature(trait_upcasting)]
+#![allow(incomplete_features)]
+
+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
+}