Reanalyze after creating a referenced part.

pkg/analyzer/lib/src/task/dart.dart

 // Copyright (c) 2015, 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.task.dart;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 1313 matching lines @@
         if (libraryNameNode == null) {
           libraryNameNode = directive.name;
           directivesToResolve.add(directive);
         }
       } else if (directive is PartDirective) {
         PartDirective partDirective = directive;
         StringLiteral partUri = partDirective.uri;
         Source partSource = partDirective.source;
         hasPartDirective = true;
         CompilationUnit partUnit = partUnitMap[partSource];
-        if (partUnit != null && context.exists(partSource)) {
+        if (partUnit != null) {
           CompilationUnitElementImpl partElement = partUnit.element;
           partElement.uriOffset = partUri.offset;
           partElement.uriEnd = partUri.end;
           partElement.uri = partDirective.uriContent;
           //
           // Validate that the part contains a part-of directive with the same
           // name as the library.
           //
-          String partLibraryName =
-              _getPartLibraryName(partSource, partUnit, directivesToResolve);
-          if (partLibraryName == null) {
-            errors.add(new AnalysisError(librarySource, partUri.offset,
-                partUri.length, CompileTimeErrorCode.PART_OF_NON_PART,
-                [partUri.toSource()]));
-          } else if (libraryNameNode == null) {
-            if (partsLibraryName == _UNKNOWN_LIBRARY_NAME) {
-              partsLibraryName = partLibraryName;
-            } else if (partsLibraryName != partLibraryName) {
-              partsLibraryName = null;
+          if (context.exists(partSource)) {
+            String partLibraryName =
+                _getPartLibraryName(partSource, partUnit, directivesToResolve);
+            if (partLibraryName == null) {
+              errors.add(new AnalysisError(librarySource, partUri.offset,
+                  partUri.length, CompileTimeErrorCode.PART_OF_NON_PART,
+                  [partUri.toSource()]));
+            } else if (libraryNameNode == null) {
+              if (partsLibraryName == _UNKNOWN_LIBRARY_NAME) {
+                partsLibraryName = partLibraryName;
+              } else if (partsLibraryName != partLibraryName) {
+                partsLibraryName = null;
+              }
+            } else if (libraryNameNode.name != partLibraryName) {
+              errors.add(new AnalysisError(librarySource, partUri.offset,
+                  partUri.length, StaticWarningCode.PART_OF_DIFFERENT_LIBRARY, [
+                libraryNameNode.name,
+                partLibraryName
+              ]));
             }
-          } else if (libraryNameNode.name != partLibraryName) {
-            errors.add(new AnalysisError(librarySource, partUri.offset,
-                partUri.length, StaticWarningCode.PART_OF_DIFFERENT_LIBRARY, [
-              libraryNameNode.name,
-              partLibraryName
-            ]));
           }
           if (entryPoint == null) {
             entryPoint = _findEntryPoint(partElement);
           }
           directive.element = partElement;
           sourcedCompilationUnits.add(partElement);
         }
       }
     }
     if (hasPartDirective && libraryNameNode == null) {
@@ skipping 2013 matching lines @@
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.first;
     _newSources.remove(currentTarget);
     return true;
   }
 }