1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/builtin-superkinds/builtin-superkinds-capabilities-transitive.rs b/src/test/ui/builtin-superkinds/builtin-superkinds-capabilities-transitive.rs
new file mode 100644
index 000000000..1f997d371
--- /dev/null
+++ b/src/test/ui/builtin-superkinds/builtin-superkinds-capabilities-transitive.rs
@@ -0,0 +1,25 @@
+// run-pass
+// Tests "transitivity" of super-builtin-kinds on traits. Here, if
+// we have a Foo, we know we have a Bar, and if we have a Bar, we
+// know we have a Send. So if we have a Foo we should know we have
+// a Send. Basically this just makes sure rustc is using
+// each_bound_trait_and_supertraits in type_contents correctly.
+
+
+use std::sync::mpsc::{channel, Sender};
+
+trait Bar : Send { }
+trait Foo : Bar { }
+
+impl <T: Send> Foo for T { }
+impl <T: Send> Bar for T { }
+
+fn foo<T: Foo + 'static>(val: T, chan: Sender<T>) {
+    chan.send(val).unwrap();
+}
+
+pub fn main() {
+    let (tx, rx) = channel();
+    foo(31337, tx);
+    assert_eq!(rx.recv().unwrap(), 31337);
+}