Removed fixed dependencies

packages/analyzer/lib/src/error.dart

 // Copyright (c) 2013, 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.
-library error;
+library analyzer.src.error;
 
 import 'dart:collection';
 
-import 'generated/error.dart';
+import 'package:analyzer/error/error.dart';
 
 /// The maximum line length when printing extracted source code when converting
 /// an [AnalyzerError] to a string.
 final _MAX_ERROR_LINE_LENGTH = 120;
 
 /// A wrapper around [AnalysisError] that provides a more user-friendly string
 /// representation.
 class AnalyzerError implements Exception {
   final AnalysisError error;
 
   AnalyzerError(this.error);
 
   String get message => toString();
 
+  @override
   String toString() {
     var builder = new StringBuffer();
 
     // Print a less friendly string representation to ensure that
     // error.source.contents is not executed, as .contents it isn't async
-    builder.write("Error in ${error.source.shortName}: ${error.message}");
+    String sourceName = error.source.shortName;
+    sourceName ??= '<unknown source>';
+    builder.write("Error in $sourceName: ${error.message}");
 
 //    var content = error.source.contents.data;
 //    var beforeError = content.substring(0, error.offset);
 //    var lineNumber = "\n".allMatches(beforeError).length + 1;
 //    builder.writeln("Error on line $lineNumber of ${error.source.fullName}: "
 //        "${error.message}");
 
 //    var errorLineIndex = beforeError.lastIndexOf("\n") + 1;
 //    var errorEndOfLineIndex = content.indexOf("\n", error.offset);
 //    if (errorEndOfLineIndex == -1) errorEndOfLineIndex = content.length;
@@ skipping 43 matching lines @@
   /// Creates an [AnalyzerErrorGroup] from a list of lower-level
   /// [AnalysisError]s.
   AnalyzerErrorGroup.fromAnalysisErrors(Iterable<AnalysisError> errors)
       : this(errors.map((e) => new AnalyzerError(e)));
 
   /// The errors in this collection.
   List<AnalyzerError> get errors =>
       new UnmodifiableListView<AnalyzerError>(_errors);
 
   String get message => toString();
+  @override
   String toString() => errors.join("\n");
 }