Use words please.

runtime/observatory/tests/service/eval_test.dart

 // Copyright (c) 2015, 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.
 // VMOptions=--compile-all --error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:async';
 
@@ skipping 13 matching lines @@
     if (++i % 100000000 == 0) {
       MyClass.printValue(10000);
     }
   }
 }
 
 var tests = [
 
 // Go to breakpoint at line 16.
 (Isolate isolate) {
-  return isolate.rootLib.load().then((_) {
+  return isolate.rootLibrary.load().then((_) {
       // Set up a listener to wait for breakpoint events.
       Completer completer = new Completer();
       isolate.vm.events.stream.listen((ServiceEvent event) {
         if (event.eventType == ServiceEvent.kPauseBreakpoint) {
           print('Breakpoint reached');
           completer.complete();
         }
       });
 
       // Add the breakpoint.
-      var script = isolate.rootLib.scripts[0];
+      var script = isolate.rootLibrary.scripts[0];
       var line = 16;
       return isolate.addBreakpoint(script, line).then((ServiceObject bpt) {
           return completer.future;  // Wait for breakpoint reached.
       });
     });
 },
 
 // Evaluate against library, class, and instance.
 (Isolate isolate) {
   return isolate.getStack().then((ServiceMap stack) {
       // Make sure we are in the right place.
       expect(stack.type, equals('Stack'));
       expect(stack['frames'].length, greaterThanOrEqualTo(2));
       expect(stack['frames'][0]['function'].name, equals('printValue'));
       expect(stack['frames'][0]['function'].dartOwner.name, equals('MyClass'));
 
-      var lib = isolate.rootLib;
+      var lib = isolate.rootLibrary;
       var cls = stack['frames'][0]['function'].dartOwner;
       var instance = stack['frames'][0]['vars'][0]['value'];
 
       List evals = [];
-      evals.add(isolate.eval(lib, 'globalVar + 5').then((result) {
+      evals.add(lib.evaluate('globalVar + 5').then((result) {
             print(result);
             expect(result.valueAsString, equals('105'));
           }));
-      evals.add(isolate.eval(lib, 'globalVar + staticVar + 5').then((result) {
+      evals.add(lib.evaluate('globalVar + staticVar + 5').then((result) {
             expect(result.type, equals('Error'));
           }));
-      evals.add(isolate.eval(cls, 'globalVar + staticVar + 5').then((result) {
+      evals.add(cls.evaluate('globalVar + staticVar + 5').then((result) {
             print(result);
             expect(result.valueAsString, equals('1105'));
           }));
-      evals.add(isolate.eval(cls, 'this + 5').then((result) {
+      evals.add(cls.evaluate('this + 5').then((result) {
             expect(result.type, equals('Error'));
           }));
-      evals.add(isolate.eval(instance, 'this + 5').then((result) {
+      evals.add(instance.evaluate('this + 5').then((result) {
             print(result);
             expect(result.valueAsString, equals('10005'));
           }));
-      evals.add(isolate.eval(instance, 'this + frog').then((result) {
+      evals.add(instance.evaluate('this + frog').then((result) {
             expect(result.type, equals('Error'));
           }));
       return Future.wait(evals);
   });
 },
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction);