Fix for 'Create part' Quick Fix.

pkg/analyzer/lib/src/generated/source.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.source;
 
 import "dart:math" as math;
@@ skipping 305 matching lines @@
 
 class LocalSourcePredicate_TRUE implements LocalSourcePredicate {
   @override
   bool isLocal(Source source) => true;
 }
 
 /**
  * An implementation of an non-existing [Source].
  */
 class NonExistingSource extends Source {
-  final String _name;
+  @override
+  final String fullName;
+
+  @override
+  final Uri uri;
 
   final UriKind uriKind;
 
-  NonExistingSource(this._name, this.uriKind);
+  NonExistingSource(this.fullName, this.uri, this.uriKind);
 
   @override
   TimestampedData<String> get contents {
-    throw new UnsupportedOperationException("${_name}does not exist.");
+    throw new UnsupportedOperationException('$fullName does not exist.');
   }
 
   @override
   String get encoding {
-    throw new UnsupportedOperationException("${_name}does not exist.");
+    throw new UnsupportedOperationException('$fullName does not exist.');
   }
 
   @override
-  String get fullName => _name;
-
-  @override
-  int get hashCode => _name.hashCode;
+  int get hashCode => fullName.hashCode;
 
   @override
   bool get isInSystemLibrary => false;
 
   @override
-  int get modificationStamp => 0;
+  int get modificationStamp => -1;
 
   @override
-  String get shortName => _name;
-
-  @override
-  Uri get uri => null;
+  String get shortName => fullName;
 
   @override
   bool operator ==(Object obj) {
     if (obj is NonExistingSource) {
       NonExistingSource other = obj;
-      return other.uriKind == uriKind && (other._name == _name);
+      return other.uriKind == uriKind && other.fullName == fullName;
     }
     return false;
   }
 
   @override
   bool exists() => false;
 
   @override
   Uri resolveRelativeUri(Uri relativeUri) {
-    throw new UnsupportedOperationException("${_name}does not exist.");
+    throw new UnsupportedOperationException('$fullName does not exist.');
   }
 }
 
 /**
  * The interface `Source` defines the behavior of objects representing source code that can be
  * analyzed by the analysis engine.
  *
  * Implementations of this interface need to be aware of some assumptions made by the analysis
  * engine concerning sources:
  * * Sources are not required to be unique. That is, there can be multiple instances representing
@@ skipping 616 matching lines @@
 
   /**
    * Return an absolute URI that represents the given source, or `null` if a valid URI cannot
    * be computed.
    *
    * @param source the source to get URI for
    * @return the absolute URI representing the given source
    */
   Uri restoreAbsolute(Source source) => null;
 }