Report an error when a part-of refers to an unnamed library.

pkg/analyzer/lib/src/generated/resolver.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 analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 4938 matching lines @@
 
   static const ResolverErrorCode CONTINUE_LABEL_ON_SWITCH =
       const ResolverErrorCode('CONTINUE_LABEL_ON_SWITCH',
           "A continue label resolves to switch, must be loop or switch member");
 
   static const ResolverErrorCode MISSING_LIBRARY_DIRECTIVE_WITH_PART =
       const ResolverErrorCode('MISSING_LIBRARY_DIRECTIVE_WITH_PART',
           "Libraries that have parts must have a library directive");
 
   /**
+   * Parts: It is a static warning if the referenced part declaration
+   * <i>p</i> names a library that does not have a library tag.
+   *
+   * Parameters:
+   * 0: the URI of the expected library
+   * 1: the non-matching actual library name from the "part of" declaration
+   */
+  static const ResolverErrorCode PART_OF_UNNAMED_LIBRARY =
+      const ResolverErrorCode(
+          'PART_OF_UNNAMED_LIBRARY',
+          "Library is unnamed. Expected a URI not a library name '{0}' in the "
+          "part-of directive.",
+          "Try changing the part-of directive to a URI, or try including a"
+          " different part.");
+
+  /**
    * Initialize a newly created error code to have the given [name]. The message
    * associated with the error will be created from the given [message]
    * template. The correction associated with the error will be created from the
    * given [correction] template.
    */
   const ResolverErrorCode(String name, String message, [String correction])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => type.severity;
@@ skipping 5927 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }