diff --git a/src/test/compile-fail/issue-43784-associated-type.rs b/src/test/compile-fail/issue-43784-associated-type.rs
new file mode 100644
index 00000000000..94b5c0034a7
--- /dev/null
+++ b/src/test/compile-fail/issue-43784-associated-type.rs
@@ -0,0 +1,25 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub trait Partial<X: ?Sized>: Copy {
+}
+
+pub trait Complete {
+    type Assoc: Partial<Self>;
+}
+
+impl<T> Partial<T> for T::Assoc where
+    T: Complete
+{
+}
+
+impl<T> Complete for T { //~ ERROR the trait bound `T: std::marker::Copy` is not satisfied
+    type Assoc = T;
+}
diff --git a/src/test/compile-fail/issue-43784-supertrait.rs b/src/test/compile-fail/issue-43784-supertrait.rs
new file mode 100644
index 00000000000..e70df113da3
--- /dev/null
+++ b/src/test/compile-fail/issue-43784-supertrait.rs
@@ -0,0 +1,18 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub trait Partial: Copy {
+}
+
+pub trait Complete: Partial {
+}
+
+impl<T> Partial for T where T: Complete {}
+impl<T> Complete for T {} //~ ERROR the trait bound `T: std::marker::Copy` is not satisfied