Require two type arguments for map literals (issue 4522).

utils/tests/pub/version_solver_test.dart

 // Copyright (c) 2012, 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('pub_update_test');
 
 #import('dart:io');
 #import('dart:isolate');
 
 #import('../../pub/lock_file.dart');
@@ skipping 363 matching lines @@
  * descriptions, a package's name is calculated by taking the description string
  * and stripping off any trailing hyphen followed by non-hyphen characters.
  */
 class MockSource extends Source {
   final Map<String, Map<Version, Package>> _packages;
 
   final String name;
   bool get shouldCache() => true;
 
   MockSource(this.name)
-      : _packages = <Map<Version, Package>>{};
+      : _packages = <String, Map<Version, Package>>{};
 
   Future<List<Version>> getVersions(String name) {
     return fakeAsync(() => _packages[name].getKeys());
   }
 
   Future<Pubspec> describe(PackageId id) {
     return fakeAsync(() {
       return _packages[id.name][id.version].pubspec;
     });
   }
@@ skipping 29 matching lines @@
  * A source used for testing that doesn't natively understand versioning,
  * similar to how the Git and SDK sources work.
  */
 class MockVersionlessSource extends Source {
   final Map<String, Package> _packages;
 
   final String name = 'versionless';
   final bool shouldCache = false;
 
   MockVersionlessSource()
-    : _packages = <Package>{};
+    : _packages = <String, Package>{};
 
   Future<bool> install(PackageId id, String path) {
     throw 'no';
   }
 
   Future<Pubspec> describe(PackageId id) {
     return new Future<Pubspec>.immediate(_packages[id.description].pubspec);
   }
 
   void addPackage(Package package) {
@@ skipping 13 matching lines @@
 Pair<String, Source> parseSource(String name) {
   var match = new RegExp(@"(.*) from (.*)").firstMatch(name);
   if (match == null) return new Pair<String, Source>(name, source1);
   switch (match[2]) {
   case 'mock1': return new Pair<String, Source>(match[1], source1);
   case 'mock2': return new Pair<String, Source>(match[1], source2);
   case 'versionless':
     return new Pair<String, Source>(match[1], versionlessSource);
   }
 }