Add UnlinkedUnit.isPartOf flag.

pkg/analyzer/lib/src/summary/summarize_ast.dart

 // Copyright (c) 2016, 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 serialization.summarize_ast;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/type.dart' show DartType;
@@ skipping 280 matching lines @@
    * into [UnlinkedUnit.references] for the name itself.
    */
   final Map<int, Map<String, int>> nameToReference = <int, Map<String, int>>{};
 
   /**
    * True if the 'dart:core' library is been summarized.
    */
   bool isCoreLibrary = false;
 
   /**
+   * True is a [PartOfDirective] was found, so the unit is a part.
+   */
+  bool isPartOf = false;
+
+  /**
    * If the library has a library directive, the library name derived from it.
    * Otherwise `null`.
    */
   String libraryName;
 
   /**
    * If the library has a library directive, the offset of the library name.
    * Otherwise `null`.
    */
   int libraryNameOffset;
@@ skipping 200 matching lines @@
    */
   UnlinkedUnitBuilder serializeCompilationUnit(
       CompilationUnit compilationUnit) {
     compilationUnit.directives.accept(this);
     if (!hasCoreBeenImported) {
       unlinkedImports.add(new UnlinkedImportBuilder(isImplicit: true));
     }
     compilationUnit.declarations.accept(this);
     UnlinkedUnitBuilder b = new UnlinkedUnitBuilder();
     b.lineStarts = compilationUnit.lineInfo?.lineStarts;
+    b.isPartOf = isPartOf;
     b.libraryName = libraryName;
     b.libraryNameOffset = libraryNameOffset;
     b.libraryNameLength = libraryNameLength;
     b.libraryDocumentationComment = libraryDocumentationComment;
     b.libraryAnnotations = libraryAnnotations;
     b.codeRange = serializeCodeRange(compilationUnit);
     b.classes = classes;
     b.enums = enums;
     b.executables = executables;
     b.exports = exports;
@@ skipping 807 matching lines @@
   void visitPartDirective(PartDirective node) {
     parts.add(new UnlinkedPartBuilder(
         uriOffset: node.uri.offset,
         uriEnd: node.uri.end,
         annotations: serializeAnnotations(node.metadata)));
   }
 
   @override
   void visitPartOfDirective(PartOfDirective node) {
     isCoreLibrary = node.libraryName.name == 'dart.core';
+    isPartOf = true;
   }
 
   @override
   UnlinkedParamBuilder visitSimpleFormalParameter(SimpleFormalParameter node) {
     UnlinkedParamBuilder b = serializeParameter(node);
     b.type = serializeTypeName(node.type);
     return b;
   }
 
   @override
@@ skipping 33 matching lines @@
 /**
  * A [_TypeParameterScope] is a [_Scope] which defines [_ScopedTypeParameter]s.
  */
 class _TypeParameterScope extends _Scope {
   /**
    * Get the number of [_ScopedTypeParameter]s defined in this
    * [_TypeParameterScope].
    */
   int get length => _definedNames.length;
 }