two more tests for method autoderef

Author: nikomatsakis

src/test/run-pass/autoderef-method-twice-but-not-thrice.rs

@@ -0,0 +1,8 @@
+impl methods for @@uint {
+    fn double() -> uint { **self * 2u }
+}
+
+fn main() {
+    let x = @@@@@3u;
+    assert x.double() == 6u;
+}

src/test/run-pass/autoderef-method-twice.rs

@@ -0,0 +1,8 @@
+impl methods for uint {
+    fn double() -> uint { self * 2u }
+}
+
+fn main() {
+    let x = @@3u;
+    assert x.double() == 6u;
+}