pkg/matcher: a few more strong-mode fixes

test/pretty_print_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.
 
 import 'dart:collection';
 
 import 'package:matcher/matcher.dart';
 import 'package:matcher/src/pretty_print.dart';
 import 'package:test/test.dart' show group, test, expect;
 
@@ skipping 102 matching lines @@
       expect(prettyPrint([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], maxItems: 10),
           equals("[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"));
     });
 
     test("that's over maxItems", () {
       expect(prettyPrint([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], maxItems: 9),
           equals("[0, 1, 2, 3, 4, 5, 6, 7, ...]"));
     });
 
     test("that's recursive", () {
-      var list = [1, 2, 3];
+      var list = <dynamic>[1, 2, 3];
       list.add(list);
       expect(prettyPrint(list), equals("[1, 2, 3, (recursive)]"));
     });
   });
 
   group("with a map", () {
     test('containing primitive objects', () {
       expect(prettyPrint({'foo': 1, 'bar': true}),
           equals("{'foo': 1, 'bar': true}"));
     });
@@ skipping 92 matching lines @@
     test("that's not a list", () {
       expect(prettyPrint([1, 2, 3, 4].map((n) => n * 2)),
           equals("MappedListIterable:[2, 4, 6, 8]"));
     });
 
     test("that's not a list and has a private name", () {
       expect(prettyPrint(new _PrivateNameIterable()), equals("?:[1, 2, 3]"));
     });
   });
 }