Fix for issue 20125 - improved error messages

pkg/analyzer/lib/src/generated/error.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.
 
 library engine.error;
 
 import 'dart:collection';
 import 'java_core.dart';
 import 'source.dart';
 import 'scanner.dart' show Token;
@@ skipping 3262 matching lines @@
   static const StaticWarningCode EQUAL_KEYS_IN_MAP = const StaticWarningCode('EQUAL_KEYS_IN_MAP', "Keys in a map cannot be equal");
 
   /**
    * 14.2 Exports: It is a static warning to export two different libraries with
    * the same name.
    *
    * @param uri1 the uri pointing to a first library
    * @param uri2 the uri pointing to a second library
    * @param name the shared name of the exported libraries
    */
-  static const StaticWarningCode EXPORT_DUPLICATED_LIBRARY_NAME = const StaticWarningCode('EXPORT_DUPLICATED_LIBRARY_NAME', "The exported libraries '{0}' and '{1}' should not have the same name '{2}'");
+  static const StaticWarningCode EXPORT_DUPLICATED_LIBRARY_NAMED
+      = const StaticWarningCode(
+          'EXPORT_DUPLICATED_LIBRARY_NAMED',
+          "The exported libraries '{0}' and '{1}' cannot have the same name '{2}'");
+
+  /**
+   * 14.2 Exports: It is a static warning to export two different libraries with
+   * the same name.
+   *
+   * @param uri1 the uri pointing to a first library
+   * @param uri2 the uri pointing to a second library
+   */
+  static const StaticWarningCode EXPORT_DUPLICATED_LIBRARY_UNNAMED
+      = const StaticWarningCode(
+          'EXPORT_DUPLICATED_LIBRARY_UNNAMED',
+          "The exported libraries '{0}' and '{1}' cannot both be unnamed");
 
   /**
    * 12.14.2 Binding Actuals to Formals: It is a static warning if <i>m &lt;
    * h</i> or if <i>m &gt; n</i>.
    *
    * @param requiredCount the maximum number of positional arguments
    * @param argumentCount the actual number of positional arguments given
    * @see [NOT_ENOUGH_REQUIRED_ARGUMENTS]
    */
   static const StaticWarningCode EXTRA_POSITIONAL_ARGUMENTS = const StaticWarningCode('EXTRA_POSITIONAL_ARGUMENTS', "{0} positional arguments expected, but {1} found");
@@ skipping 66 matching lines @@
   static const StaticWarningCode FUNCTION_WITHOUT_CALL = const StaticWarningCode('FUNCTION_WITHOUT_CALL', "Concrete classes that implement Function must implement the method call()");
 
   /**
    * 14.1 Imports: It is a static warning to import two different libraries with
    * the same name.
    *
    * @param uri1 the uri pointing to a first library
    * @param uri2 the uri pointing to a second library
    * @param name the shared name of the imported libraries
    */
-  static const StaticWarningCode IMPORT_DUPLICATED_LIBRARY_NAME = const StaticWarningCode('IMPORT_DUPLICATED_LIBRARY_NAME', "The imported libraries '{0}' and '{1}' should not have the same name '{2}'");
+  static const StaticWarningCode IMPORT_DUPLICATED_LIBRARY_NAMED
+      = const StaticWarningCode(
+          'IMPORT_DUPLICATED_LIBRARY_NAMED',
+          "The imported libraries '{0}' and '{1}' cannot have the same name '{2}'");
+
+  /**
+   * 14.1 Imports: It is a static warning to import two different libraries with
+   * the same name.
+   *
+   * @param uri1 the uri pointing to a first library
+   * @param uri2 the uri pointing to a second library
+   */
+  static const StaticWarningCode IMPORT_DUPLICATED_LIBRARY_UNNAMED
+      = const StaticWarningCode(
+          'IMPORT_DUPLICATED_LIBRARY_UNNAMED',
+          "The imported libraries '{0}' and '{1}' cannot both be unnamed");
 
   /**
    * 14.1 Imports: It is a static warning if the specified URI of a deferred
    * import does not refer to a library declaration.
    *
    * @param uri the uri pointing to a non-library declaration
    * @see [CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY]
    */
   static const StaticWarningCode IMPORT_OF_NON_LIBRARY = const StaticWarningCode('IMPORT_OF_NON_LIBRARY', "The imported library '{0}' must not have a part-of directive");
 
@@ skipping 643 matching lines @@
    * Initialize a newly created error code to have the given [name].
    */
   const TodoCode(String name) : super(name, "{0}");
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
   ErrorType get type => ErrorType.TODO;
 }