Fixes to associating existing elements with an AST

pkg/analyzer/test/generated/declaration_resolver_test.dart

Index: pkg/analyzer/test/generated/declaration_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/declaration_resolver_test.dart b/pkg/analyzer/test/generated/declaration_resolver_test.dart
index 4f0b214bdd889f132fc0d37a4a6e4147bc0641c8..79bf1cf4ea24f202441ff9f51d44eac2c6ad350e 100644
--- a/pkg/analyzer/test/generated/declaration_resolver_test.dart
+++ b/pkg/analyzer/test/generated/declaration_resolver_test.dart
@@ -10,6 +10,9 @@ import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/task/dart.dart';
+import 'package:analyzer/task/dart.dart';
 import 'package:unittest/unittest.dart';
 
 import '../reflective_tests.dart';
@@ -145,6 +148,17 @@ class DeclarationResolverMetadataTest extends ResolverTestCase {
     checkMetadata('import');
   }
 
+  void test_metadata_importDirective_partiallyResolved() {
+    addNamedSource('/foo.dart', 'class C {}');
+    this.code = 'const a = null; @a import "foo.dart";';
+    Source source = addNamedSource('/test.dart', code);
+    LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
+    analysisContext.computeResult(source, LIBRARY_ELEMENT1);
+    unit = analysisContext.computeResult(target, RESOLVED_UNIT1);
+    unit2 = _cloneResolveUnit(unit);
+    checkMetadata('import');
+  }
+
   void test_metadata_libraryDirective() {
     setupCode('@a library L;');
     checkMetadata('L');