Further cleanups to annotation elements now that #25706 is fixed.

pkg/analyzer/lib/src/summary/resynthesize.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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 1493 matching lines @@
       elementAnnotation.element = constExpr.staticElement;
       Identifier typeName = constExpr.constructorName.type.name;
       SimpleIdentifier constructorName = constExpr.constructorName.name;
       if (typeName is SimpleIdentifier && constructorName != null) {
         // E.g. `@cls.ctor()`.  Since `cls.ctor` would have been parsed as
         // a PrefixedIdentifier, we need to resynthesize it as one.
         typeName = AstFactory.identifier(typeName, constructorName);
         constructorName = null;
       }
       elementAnnotation.annotationAst = AstFactory.annotation2(
-          typeName, constructorName, constExpr.argumentList);
+          typeName, constructorName, constExpr.argumentList)
+        ..element = constExpr.staticElement;
     } else {
       throw new StateError(
           'Unexpected annotation type: ${constExpr.runtimeType}');
     }
     return elementAnnotation;
   }
 
   /**
    * Build an implicit getter for the given [property] and bind it to the
    * [property] and to its enclosing element.
@@ skipping 332 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }