Use ElementAnnotation as the ConstantEvaluationTarget for annotations.

pkg/analyzer/lib/src/dart/element/element.dart

 // Copyright (c) 2014, 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.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1555 matching lines @@
 
   /**
    * The element representing the field, variable, or constructor being used as
    * an annotation.
    */
   Element element;
 
   /**
    * The compliation unit in which this annotation appears.
    */
-  final CompilationUnitElement compilationUnit;
+  final CompilationUnitElementImpl compilationUnit;
+
+  /**
+   * The AST of the annotation itself, cloned from the resolved AST for the
+   * source code.
+   */
+  Annotation annotationAst;
 
   /**
    * The result of evaluating this annotation as a compile-time constant
    * expression, or `null` if the compilation unit containing the variable has
    * not been resolved.
    */
   EvaluationResultImpl evaluationResult;
 
   /**
    * Initialize a newly created annotation. The given [compilationUnit] is the
    * compilation unit in which the annotation appears.
    */
   ElementAnnotationImpl(this.compilationUnit);
 
   @override
   DartObject get constantValue => evaluationResult.value;
 
   @override
+  AnalysisContext get context => compilationUnit.library.context;
+
+  @override
   bool get isDeprecated {
     if (element != null) {
       LibraryElement library = element.library;
       if (library != null && library.isDartCore) {
         if (element is ConstructorElement) {
           ConstructorElement constructorElement = element as ConstructorElement;
           if (constructorElement.enclosingElement.name ==
               _DEPRECATED_CLASS_NAME) {
             return true;
           }
@@ skipping 27 matching lines @@
       if (library != null && library.isDartCore) {
         if (element is PropertyAccessorElement &&
             element.name == PROXY_VARIABLE_NAME) {
           return true;
         }
       }
     }
     return false;
   }
 
+  /**
+   * Get the library containing this annotation.
+   */
+  Source get librarySource => compilationUnit.librarySource;
+
+  @override
+  Source get source => compilationUnit.source;
+
   @override
   String toString() => '@$element';
 }
 
 /**
  * A base class for concrete implementations of an [Element].
  */
 abstract class ElementImpl implements Element {
   /**
    * An Unicode right arrow.
@@ skipping 2452 matching lines @@
   ParameterElementImpl(String name, int nameOffset) : super(name, nameOffset);
 
   /**
    * Initialize a newly created parameter element to have the given [name].
    */
   ParameterElementImpl.forNode(Identifier name) : super.forNode(name);
 
   /**
    * Creates a synthetic parameter with [name], [type] and [kind].
    */
-  factory ParameterElementImpl.synthetic(String name, DartType type,
-      ParameterKind kind) {
+  factory ParameterElementImpl.synthetic(
+      String name, DartType type, ParameterKind kind) {
     ParameterElementImpl element = new ParameterElementImpl(name, -1);
     element.type = type;
     element.synthetic = true;
     element.parameterKind = kind;
     return element;
   }
 
   @override
   String get defaultValueCode => _defaultValueCode;
 
@@ skipping 646 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }