Implement trait inheritance for bounded type parameters

src/test/compile-fail/trait-inheritance-missing-requirement.rs

@@ -0,0 +1,23 @@
+// xfail-test
+// error-pattern: what
+
+trait Foo {
+    fn f();
+}
+
+trait Bar : Foo {
+    fn g();
+}
+
+struct A {
+    x: int
+}
+
+// Can't implement Bar without an impl of Foo
+impl A : Bar {
+    fn g() { }
+}
+
+fn main() {
+}
+