Use generic functions in zones.

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1001 matching lines @@
       }
 
       _numProcesses++;
       if (isBrowserCommand) _numBrowserProcesses++;
 
       var node = enqueuer.command2node[command];
       Iterable<TestCase> testCases = enqueuer.command2testCases[command];
       // If a command is part of many TestCases we set the timeout to be
       // the maximum over all [TestCase.timeout]s. At some point, we might
       // eliminate [TestCase.timeout] completely and move it to [Command].
-      int timeout =
-          testCases.map((TestCase test) => test.timeout).fold(0, math.max);
+      int timeout = testCases
+          .map((TestCase test) => test.timeout)
+          .fold(0, (int a, b) => math.max(a, b));
 
       if (_verbose) {
         print('Running "${command.displayName}" command: $command');
       }
 
       executor.runCommand(node, command, timeout).then((CommandOutput output) {
         assert(command == output.command);
 
         _commandOutputStream.add(output);
         if (output.canRunDependendCommands) {
@@ skipping 613 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }