Add generic types to Sort and Comparable. Fix crasher bug in codegen.

lib/src/compiler/code_generator.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.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' show Token, TokenType;
@@ skipping 3093 matching lines @@
         if (name != null) {
           ctor = new JS.PropertyAccess(ctor, _propertyName(name.name));
         }
       } else {
         ctor = _emitConstructorName(element, type, name);
         isFactory = element.isFactory;
       }
       var args = _visit(argumentList) as List<JS.Expression>;
       return isFactory ? new JS.Call(ctor, args) : new JS.New(ctor, args);
     }
-    if (_isObjectLiteral(element.enclosingElement)) {

[Jacob, 2016/05/25 16:38:04]

this was crashing on some google3 code.

+    if (element != null && _isObjectLiteral(element.enclosingElement)) {
       return _emitObjectLiteral(argumentList);
     }
     if (isConst) return _emitConst(emitNew);
     return emitNew();
   }
 
   bool _isObjectLiteral(ClassElement classElem) {
     return findAnnotation(classElem, isPublicJSAnnotation) != null &&
         findAnnotation(classElem, isJSAnonymousAnnotation) != null;
   }
@@ skipping 1433 matching lines @@
 }
 
 bool isLibraryPrefix(Expression node) =>
     node is SimpleIdentifier && node.staticElement is PrefixElement;
 
 LibraryElement _getLibrary(AnalysisContext c, String uri) =>
     c.computeLibraryElement(c.sourceFactory.forUri(uri));
 
 bool _isDartRuntime(LibraryElement l) =>
     l.isInSdk && l.source.uri.toString() == 'dart:_runtime';