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

utils/tests/pub/test_pub.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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 108 matching lines @@
   // putting this at 10ms to be safe.
   return sleep(10);
 }
 
 /**
  * Creates an HTTP server that replicates the structure of pub.dartlang.org.
  * [pubspecs] is a list of YAML-format pubspecs representing the packages to
  * serve.
  */
 void servePackages(String host, int port, List<String> pubspecs) {
-  var packages = <Map<String, String>>{};
+  var packages = <String, Map<String, String>>{};
   pubspecs.forEach((spec) {
     var parsed = loadYaml(spec);
     var name = parsed['name'];
     var version = parsed['version'];
-    packages.putIfAbsent(name, () => <String>{})[version] = spec;
+    packages.putIfAbsent(name, () => <String, String>{})[version] = spec;
   });
 
   serve(host, port, [
     dir('packages', flatten(packages.getKeys().map((name) {
       return [
         file('$name.json',
           JSON.stringify({'versions': packages[name].getKeys()})),
         dir(name, [
           dir('versions', flatten(packages[name].getKeys().map((version) {
             return [
@@ skipping 666 matching lines @@
 }
 
 /**
  * Schedules a callback to be called after Pub is run with [runPub], even if it
  * fails.
  */
 void _scheduleCleanup(_ScheduledEvent event) {
   if (_scheduledCleanup == null) _scheduledCleanup = [];
   _scheduledCleanup.add(event);
 }