Re-triage mirror test failures on the analyzer.

tests/lib/mirrors/immutable_collections_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.
 
 library test.immutable_collections;
 
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 someException(e) => e is Exception || e is Error;
 
 checkList(Iterable l, String reason) {
-  Expect.throws(() => l[0] = 'value', someException, reason);
-  Expect.throws(() => l.add('value'), someException, reason);
-  Expect.throws(() => l.clear(), someException, reason);
+  Expect.throws(() => l[0] = 'value', someException, reason);  /// static type warning
+  Expect.throws(() => l.add('value'), someException, reason);  /// static type warning
+  Expect.throws(() => l.clear(), someException, reason);  /// static type warning
 }
 
 checkMap(Map m, String reason) {
   Expect.throws(() => m[#key] = 'value', someException, reason);
   checkList(m.keys, '$reason keys');
   checkList(m.values, '$reason values');
 }
 
 checkVariable(VariableMirror vm) {
   checkList(vm.metadata, 'VariableMirror.metadata');
@@ skipping 54 matching lines @@
   lm.getters.values.forEach(checkMethod);
   lm.setters.values.forEach(checkMethod);
   lm.variables.values.forEach(checkVariable);
 }
 
 main() {
   currentMirrorSystem().libraries.values.forEach(checkLibrary);
   checkType(currentMirrorSystem().voidType);
   checkType(currentMirrorSystem().dynamicType);
 }