1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/error-codes/E0719.rs b/tests/ui/error-codes/E0719.rs
new file mode 100644
index 00000000000..3311e190937
--- /dev/null
+++ b/tests/ui/error-codes/E0719.rs
@@ -0,0 +1,14 @@
+trait Foo: Iterator<Item = i32, Item = i32> {}
+//~^ ERROR is already specified
+
+type Unit = ();
+
+fn test() -> Box<dyn Iterator<Item = (), Item = Unit>> {
+//~^ ERROR is already specified
+    Box::new(None.into_iter())
+}
+
+fn main() {
+    let _: &dyn Iterator<Item = i32, Item = i32>;
+    test();
+}