Don't hide interceptors in mirrors.

tests/lib/mirrors/parameter_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This tests uses the multi-test "ok" feature:
 // none: Desired behaviour, passing on the VM.
 // 01: Trimmed version for dart2js.
 //
 // TODO(rmacnak,ahe): Remove multi-test when VM and dart2js are on par.
 
 /** Test of [ParameterMirror]. */
 library test.parameter_test;
 
-@MirrorsUsed(targets: 'test.parameter_test', override: '*')
+@MirrorsUsed(targets: const ['test.parameter_test', 'dart.core.int'], override: '*')
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 import 'stringify.dart';
 
 class B {
   B();
   B.foo(int x);
   B.bar(int z, x);
 
@@ skipping 121 matching lines @@
 
   MethodMirror garply = cm.declarations[#garply];
   expect('Method(s(garply) in s(B))', garply);
   expect('[Parameter(s(y) in s(garply), optional, named,'
          ' type = Class(s(int) in s(dart.core), top-level))]',
          garply.parameters);
   expect('Instance(value = <null>)', garply.parameters[0].defaultValue);
 
   MethodMirror waldo = cm.declarations[#waldo];
   expect('Method(s(waldo) in s(B))', waldo);
-  expect('[Parameter(s(z) in s(waldo),' 
+  expect('[Parameter(s(z) in s(waldo),'
          ' type = Class(s(int) in s(dart.core), top-level))]',
          waldo.parameters);
   expect('<null>', waldo.parameters[0].defaultValue);
 
   cm = reflectClass(C);
 
   MethodMirror fooInC = cm.declarations[#foo];
   expect('Method(s(foo) in s(C))', fooInC);
   expect('[Parameter(s(a) in s(foo),'
          ' type = Class(s(int) in s(dart.core), top-level)), '
          'Parameter(s(b) in s(foo),'
          ' type = TypeVariable(s(S) in s(C),'
          ' upperBound = Class(s(int) in s(dart.core), top-level)))]',
          fooInC.parameters);
 
   MethodMirror barInC = cm.declarations[#bar];
   expect('Method(s(bar) in s(C))', barInC);
   expect('[Parameter(s(a) in s(bar),'
          ' type = TypeVariable(s(S) in s(C),'
          ' upperBound = Class(s(int) in s(dart.core), top-level))), '
          'Parameter(s(b) in s(bar),'
          ' type = TypeVariable(s(T) in s(C),'
          ' upperBound = Class(s(Object) in s(dart.core), top-level))), '
          'Parameter(s(c) in s(bar),'
          ' type = Class(s(num) in s(dart.core), top-level))]',
          barInC.parameters);
 }