Fix for LibraryDirective annotations while applying resynthesized element model.

pkg/analyzer/test/generated/declaration_resolver_test.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 engine.declaration_resolver_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
+import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/declaration_resolver.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'resolver_test_case.dart';
 import 'test_support.dart';
@@ skipping 139 matching lines @@
     unit = analysisContext.computeResult(target, RESOLVED_UNIT1);
     unit2 = _cloneResolveUnit(unit);
     checkMetadata('import');
   }
 
   void test_metadata_libraryDirective() {
     setupCode('@a library L;');
     checkMetadata('L');
   }
 
+  void test_metadata_libraryDirective_resynthesized() {
+    CompilationUnit unit = resolveSource('@a library L; const a = null;');
+    expect(unit.directives.single.metadata.single.name.name, 'a');
+    var unitElement = unit.element as CompilationUnitElementImpl;
+    // Damage the unit element - as if "setAnnotations" were not called.
+    // The LibraryElement still has the metadata, we should use it.
+    unitElement.setAnnotations(unit.directives.single.offset, []);
+    expect(unitElement.library.metadata, hasLength(1));
+    // DeclarationResolver on the clone should succeed.
+    CompilationUnit clonedUnit = AstCloner.clone(unit);
+    new DeclarationResolver().resolve(clonedUnit, unit.element);
+    expect(clonedUnit.directives.single.metadata.single.name.name, 'a');
+  }
+
   void test_metadata_localFunctionDeclaration() {
     setupCode('f() { @a g() {} }');
     // Note: metadata on local function declarations is ignored by the
     // analyzer.  TODO(paulberry): is this a bug?
     FunctionDeclaration node = EngineTestCase.findNode(
         unit, code, 'g', (AstNode n) => n is FunctionDeclaration);
     expect((node as FunctionDeclarationImpl).metadata, isEmpty);
   }
 
   void test_metadata_localVariableDeclaration() {
@@ skipping 423 matching lines @@
     expect(element.type.toString(), "<T>(T, T) → T");
     expect(t.element, same(tElement));
 
     // re-resolve
     CompilationUnit unit2 = _cloneResolveUnit(unit);
     node = _findSimpleIdentifier(unit2, code, 'max').parent;
     t = node.typeParameters.typeParameters[0];
     expect(t.element, same(tElement));
   }
 }