test: Add a test for trait inheritance with self as a type parameter. rs=test-only

src/test/run-pass/trait-inheritance-self.rs

@@ -0,0 +1,29 @@
+trait Foo<T> {
+    fn f(&self, x: &T);
+}
+
+trait Bar : Foo<self> {
+    fn g(&self);
+}
+
+struct S {
+    x: int
+}
+
+impl S : Foo<S> {
+    fn f(&self, x: &S) {
+        io::println(x.x.to_str());
+    }
+}
+
+impl S : Bar {
+    fn g(&self) {
+        self.f(self);
+    }
+}
+
+fn main() {
+    let s = S { x: 1 };
+    s.g();
+}
+