Change method res to try autoref more often. Fixes #3585.

src/test/run-pass/autoref-intermediate-types-issue-3585.rs

@@ -0,0 +1,20 @@
+trait Foo {
+    fn foo(&self) -> ~str;
+}
+
+impl<T: Foo> @T: Foo {
+    fn foo(&self) -> ~str {
+        fmt!("@%s", (**self).foo())
+    }
+}
+
+impl uint: Foo {
+    fn foo(&self) -> ~str {
+        fmt!("%u", *self)
+    }
+}
+
+fn main() {
+    let x = @3u;
+    assert x.foo() == ~"@3";
+}

src/test/run-pass/autoref-vec-push.rs

@@ -0,0 +1,17 @@
+trait VecPush<T> {
+    fn push(&mut self, +t: T);
+}
+
+impl<T> ~[T]: VecPush<T> {
+    fn push(&mut self, +t: T) {
+        vec::push(*self, t);
+    }
+}
+
+fn main() {
+    let mut x = ~[];
+    x.push(1);
+    x.push(2);
+    x.push(3);
+    assert x == ~[1, 2, 3];
+}