Fix for Issue 7172.

tests/language/getter_setter_interceptor_test.dart

Index: tests/language/getter_setter_interceptor_test.dart
diff --git a/tests/language/getter_setter_interceptor_test.dart b/tests/language/getter_setter_interceptor_test.dart
index d58bbc0720e9702b07f741378a1243aa5f0ffaee..8423faba1660f1afb7a382c666d7e15de7462239 100644
--- a/tests/language/getter_setter_interceptor_test.dart
+++ b/tests/language/getter_setter_interceptor_test.dart
@@ -4,12 +4,33 @@
 
 class A {
   int length = 0;
+}
 
-  foo() => length++;
-  bar() => ++length;
+class B {
+  int length = 0;
+  foo(receiver) {
+    length++;
+    return receiver.length++;
+  }
+  bar(receiver) {
+    ++length;
+    return ++receiver.length;
+  }
 }
 
+
 main() {
-  Expect.equals(0, new A().foo());
-  Expect.equals(1, new A().bar());
+  var a = new A();
+  var b = new B();
+  var c = [1,2,3];
+
+  Expect.equals(3, b.foo(c));
+  Expect.equals(5, b.bar(c));
+  Expect.equals(5, c.length);
+
+  Expect.equals(0, b.foo(a));
+  Expect.equals(2, b.bar(a));
+  Expect.equals(2, a.length);
+
+  Expect.equals(4, b.length);
 }