Issue 14363. Support for type promotion when '(v) is T'.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/ResolverVisitor.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 839 matching lines @@
   }
 
   /**
    * Return the static element associated with the given expression whose type can be promoted, or
    * {@code null} if there is no element whose type can be promoted.
    * 
    * @param expression the expression with which the element is associated
    * @return the element associated with the given expression
    */
   protected VariableElement getPromotionStaticElement(Expression expression) {
+    while (expression instanceof ParenthesizedExpression) {
+      expression = ((ParenthesizedExpression) expression).getExpression();
+    }
     if (!(expression instanceof SimpleIdentifier)) {
       return null;
     }
     SimpleIdentifier identifier = (SimpleIdentifier) expression;
     Element element = identifier.getStaticElement();
     if (!(element instanceof VariableElement)) {
       return null;
     }
     ElementKind kind = element.getKind();
     if (kind == ElementKind.LOCAL_VARIABLE) {
@@ skipping 522 matching lines @@
    * 
    * @param expression the node whose type is to be recorded
    * @param type the propagated type of the node
    */
   private void recordPropagatedType(Expression expression, Type type) {
     if (type != null && !type.isDynamic()) {
       expression.setPropagatedType(type);
     }
   }
 }