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

pkg/analyzer/lib/error/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 analyzer.error.error;
 
 import 'dart:collection';
 
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart' show ScannerErrorCode;
@@ skipping 450 matching lines @@
   ParserErrorCode.VAR_TYPEDEF,
   ParserErrorCode.VOID_PARAMETER,
   ParserErrorCode.VOID_VARIABLE,
   ParserErrorCode.WITH_BEFORE_EXTENDS,
   ParserErrorCode.WITH_WITHOUT_EXTENDS,
   ParserErrorCode.WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER,
   ParserErrorCode.WRONG_TERMINATOR_FOR_PARAMETER_GROUP,
   ResolverErrorCode.BREAK_LABEL_ON_SWITCH_MEMBER,
   ResolverErrorCode.CONTINUE_LABEL_ON_SWITCH,
   ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART,
+  ResolverErrorCode.PART_OF_UNNAMED_LIBRARY,
   ScannerErrorCode.EXPECTED_TOKEN,
   ScannerErrorCode.ILLEGAL_CHARACTER,
   ScannerErrorCode.MISSING_DIGIT,
   ScannerErrorCode.MISSING_HEX_DIGIT,
   ScannerErrorCode.MISSING_IDENTIFIER,
   ScannerErrorCode.MISSING_QUOTE,
   ScannerErrorCode.UNABLE_GET_CONTENT,
   ScannerErrorCode.UNTERMINATED_MULTI_LINE_COMMENT,
   ScannerErrorCode.UNTERMINATED_STRING_LITERAL,
   StaticTypeWarningCode.EXPECTED_ONE_LIST_TYPE_ARGUMENTS,
@@ skipping 363 matching lines @@
    * a single list of errors.
    */
   static List<AnalysisError> mergeLists(List<List<AnalysisError>> errorLists) {
     Set<AnalysisError> errors = new HashSet<AnalysisError>();
     for (List<AnalysisError> errorList in errorLists) {
       errors.addAll(errorList);
     }
     return errors.toList();
   }
 }