Implement trait inheritance for bounded type parameters

src/test/run-pass/trait-inheritance-cross-trait-call.rs

@@ -0,0 +1,17 @@
+trait Foo { fn f() -> int; }
+trait Bar : Foo { fn g() -> int; }
+
+struct A { x: int }
+
+impl A : Foo { fn f() -> int { 10 } }
+
+impl A : Bar {
+    // Testing that this impl can call the impl of Foo
+    fn g() -> int { self.f() }
+}
+
+fn main() {
+    let a = &A { x: 3 };
+    assert a.g() == 10;
+}
+