diff --git a/src/test/run-pass/builtin-superkinds-capabilities-transitive.rs b/src/test/run-pass/builtin-superkinds-capabilities-transitive.rs
new file mode 100644
index 000000000000..8b9cd0574574
--- /dev/null
+++ b/src/test/run-pass/builtin-superkinds-capabilities-transitive.rs
@@ -0,0 +1,25 @@
+// Copyright 2013 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.
+
+trait Bar : Send { }
+trait Foo : Bar { }
+
+impl <T: Send> Foo for T { }
+impl <T: Send> Bar for T { }
+
+fn foo<T: Foo>(val: T, chan: std::comm::Chan<T>) {
+    chan.send(val);
+}
+
+fn main() {
+    let (p,c) = std::comm::stream();
+    foo(31337, c);
+    assert!(p.recv() == 31337);
+}
diff --git a/src/test/run-pass/builtin-superkinds-capabilities-xc.rs b/src/test/run-pass/builtin-superkinds-capabilities-xc.rs
new file mode 100644
index 000000000000..850128962537
--- /dev/null
+++ b/src/test/run-pass/builtin-superkinds-capabilities-xc.rs
@@ -0,0 +1,30 @@
+// Copyright 2013 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.
+
+// aux-build:trait_superkinds_in_metadata.rs
+
+extern mod trait_superkinds_in_metadata;
+use trait_superkinds_in_metadata::{Foo, Bar};
+
+#[deriving(Eq)]
+struct X<T>(T);
+
+impl <T: Freeze> Bar for X<T> { }
+impl <T: Freeze+Send> Foo for X<T> { }
+
+fn foo<T: Foo>(val: T, chan: std::comm::Chan<T>) {
+    chan.send(val);
+}
+
+fn main() {
+    let (p,c) = std::comm::stream();
+    foo(X(31337), c);
+    assert!(p.recv() == X(31337));
+}
diff --git a/src/test/run-pass/builtin-superkinds-capabilities.rs b/src/test/run-pass/builtin-superkinds-capabilities.rs
new file mode 100644
index 000000000000..639c78bd657b
--- /dev/null
+++ b/src/test/run-pass/builtin-superkinds-capabilities.rs
@@ -0,0 +1,23 @@
+// Copyright 2013 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.
+
+trait Foo : Send { }
+
+impl <T: Send> Foo for T { }
+
+fn foo<T: Foo>(val: T, chan: std::comm::Chan<T>) {
+    chan.send(val);
+}
+
+fn main() {
+    let (p,c) = std::comm::stream();
+    foo(31337, c);
+    assert!(p.recv() == 31337);
+}