Make pub strong-mode clean.

lib/src/solver/solve_report.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 'package:pub_semver/pub_semver.dart';
 
 import '../lock_file.dart';
 import '../log.dart' as log;
 import '../package.dart';
 import '../source_registry.dart';
@@ skipping 86 matching lines @@
     var names = _result.packages.map((id) => id.name).toList();
     names.remove(_root.name);
     names.sort();
     names.forEach(_reportPackage);
 
     // Show any removed ones.
     var removed = _previousLockFile.packages.keys.toSet();
     removed.removeAll(names);
     if (removed.isNotEmpty) {
       _output.writeln("These packages are no longer being depended on:");
-      removed = removed.toList();
-      removed.sort();
-      removed.forEach((name) => _reportPackage(name, alwaysShow: true));
+      for (var name in ordered(removed)) {
+        _reportPackage(name, alwaysShow: true);
+      }
     }
 
     log.message(_output);
   }
 
   /// Displays a warning about the overrides currently in effect.
   void _reportOverrides() {
     _output.clear();
 
     if (_result.overrides.isNotEmpty) {
@@ skipping 117 matching lines @@
   /// Writes a terse description of [id] (not including its name) to the output.
   void _writeId(PackageId id) {
     _output.write(id.version);
 
     if (id.source != _sources.defaultSource) {
       var description = id.source.formatDescription(_root.dir, id.description);
       _output.write(" from ${id.source} $description");
     }
   }
 }