Make first and last getters.

tests/standalone/io/test_runner_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.
 
 #import("dart:io");
 #import("dart:isolate");
 #import("../../../tools/testing/dart/test_runner.dart");
 #import("../../../tools/testing/dart/status_file_parser.dart");
 #import("../../../tools/testing/dart/test_options.dart");
 #source("process_test_util.dart");
 
 class TestController {
   static const int numTests = 4;
   static int numCompletedTests = 0;
 
   // Used as TestCase.completedCallback.
   static processCompletedTest(TestCase testCase) {
     TestOutput output = testCase.output;
-    print("Test: ${testCase.commands.last().commandLine}");
+    print("Test: ${testCase.commands.last.commandLine}");
     if (output.unexpectedOutput) {
       throw "Unexpected output: ${output.result}";
     }
     print("stdout: ");
     for (var line in output.stdout) print(line);
     print("stderr: ");
     for (var line in output.stderr) print(line);
 
     print("Time: ${output.time}");
     print("Exit code: ${output.exitCode}");
@@ skipping 56 matching lines @@
         break;
       case 'timeout':
         // Run for 10 seconds, then exit.  This tests a 2 second timeout.
         new Timer(10 * 1000, (t){ });
         break;
       default:
         throw "Unknown option ${arguments[0]} passed to test_runner_test";
     }
   }
 }