Fix summary resynthesis in the event of a self-import.

pkg/analyzer/test/src/summary/summary_common.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.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 7254 matching lines @@
 
 p.A a;
 p.B b;
 ''');
     checkTypeRef(findVariable('a').type, absUri('/a.dart'), 'a.dart', 'A',
         expectedPrefix: 'p');
     checkTypeRef(findVariable('b').type, absUri('/b.dart'), 'b.dart', 'B',
         expectedPrefix: 'p');
   }
 
+  test_import_self() {
+    if (!checkAstDerivedData) {
+      // TODO(paulberry): this test fails when building the summary from the
+      // element model because the element model can't tell the difference
+      // between self references via a local name and self references via a
+      // self-import.
+      return;
+    }
+    serializeLibraryText('''
+import 'test.dart' as p;
+class C {}
+class D extends p.C {} // Prevent "unused import" warning
+''');
+    expect(unlinkedUnits[0].imports[0].uri, 'test.dart');
+    checkDependency(
+        linked.importDependencies[0], absUri('/test.dart'), 'test.dart');
+    checkTypeRef(unlinkedUnits[0].classes[1].supertype, absUri('/test.dart'),
+        'test.dart', 'C',
+        expectedPrefix: 'p');
+  }
+
   test_import_show_order() {
     String libraryText =
         'import "dart:async" show Future, Stream; Future x; Stream y;';
     serializeLibraryText(libraryText);
     // Second import is the implicit import of dart:core
     expect(unlinkedUnits[0].imports, hasLength(2));
     expect(unlinkedUnits[0].imports[0].combinators, hasLength(1));
     expect(unlinkedUnits[0].imports[0].combinators[0].shows, hasLength(2));
     expect(unlinkedUnits[0].imports[0].combinators[0].hides, isEmpty);
     expect(unlinkedUnits[0].imports[0].combinators[0].shows[0], 'Future');
@@ skipping 2072 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }