Check for compile-time constants in DartCompiler

compiler/java/com/google/dart/compiler/ast/DartIdentifier.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler.ast;
 
 import com.google.dart.compiler.common.Symbol;
 import com.google.dart.compiler.resolver.Element;
 
 /**
@@ skipping 32 matching lines @@
 
   @Override
   public boolean isAssignable() {
     return true;
   }
 
   public String getTargetName() {
     return targetName;
   }
 
+ /**
+  * Different access from getSymbol() to help distinguish parts of an expression
+  * when walking a DartPropertyAccess.
+  */
   public Element getTargetSymbol() {
     return targetSymbol;
   }
 
   @Override
   public void setSymbol(Symbol symbol) {
     this.targetSymbol = (Element) symbol;
   }
 
   @Override
@@ skipping 14 matching lines @@
   @Override
   public void setReferencedElement(Element element) {
     referencedElement = element;
   }
 
   @Override
   public Element getReferencedElement() {
     return referencedElement;
   }
 }