Program: 40258
Project: 40258
Buggy source:
/** 
 * create a CAstNode l representing a loop that traverses the prototype chain from receiver searching for the constant property element. update nodeMap to map root to an expression that reads the property from the right node.
 * @param root
 * @param receiver
 * @param element
 * @param context
 * @param nodeMap
 * @return
 */
private CAstNode makeConstRead(CAstNode root,CAstNode receiver,CAstNode element,RewriteContext context,Map<Pair<CAstNode,NoKey>,CAstNode> nodeMap){
  CAstNode get, result;
  String receiverTemp=TEMP_NAME + (readTempCounter++);
  String elt=(String)element.getValue();
  if (elt.equals("String_Node_Str") || elt.equals("String_Node_Str")) {
    result=Ast.makeNode(CAstNode.BLOCK_EXPR,get=Ast.makeNode(CAstNode.OBJECT_REF,receiver,Ast.makeConstant(elt)));
  }
 else {
    if (context.inAssignment()) {
      context.setAssign(Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt));
    }
    result=Ast.makeNode(CAstNode.BLOCK_EXPR,Ast.makeNode(CAstNode.DECL_STMT,Ast.makeConstant(new InternalCAstSymbol(receiverTemp,false,false)),receiver),Ast.makeNode(CAstNode.LOOP,Ast.makeNode(CAstNode.UNARY_EXPR,CAstOperator.OP_NOT,Ast.makeNode(CAstNode.IS_DEFINED_EXPR,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt))),Ast.makeNode(CAstNode.ASSIGN,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeNode(CAstNode.OBJECT_REF,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant("String_Node_Str")))),get=Ast.makeNode(CAstNode.OBJECT_REF,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt)));
  }
  nodeMap.put(Pair.make(root,context.key()),get);
  return result;
}

Fixed version (ground truth):
/** 
 * create a CAstNode l representing a loop that traverses the prototype chain from receiver searching for the constant property element. update nodeMap to map root to an expression that reads the property from the right node.
 * @param root
 * @param receiver
 * @param element
 * @param context
 * @param nodeMap
 * @return
 */
private CAstNode makeConstRead(CAstNode root,CAstNode receiver,CAstNode element,RewriteContext context,Map<Pair<CAstNode,ExpanderKey>,CAstNode> nodeMap){
  CAstNode get, result;
  String receiverTemp=TEMP_NAME + (readTempCounter++);
  String elt=(String)element.getValue();
  if (elt.equals("String_Node_Str") || elt.equals("String_Node_Str")) {
    result=Ast.makeNode(CAstNode.BLOCK_EXPR,get=Ast.makeNode(CAstNode.OBJECT_REF,receiver,Ast.makeConstant(elt)));
  }
 else {
    if (context.inAssignment()) {
      context.setAssign(Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt));
    }
    result=Ast.makeNode(CAstNode.BLOCK_EXPR,Ast.makeNode(CAstNode.DECL_STMT,Ast.makeConstant(new InternalCAstSymbol(receiverTemp,false,false)),receiver),Ast.makeNode(CAstNode.LOOP,Ast.makeNode(CAstNode.UNARY_EXPR,CAstOperator.OP_NOT,Ast.makeNode(CAstNode.IS_DEFINED_EXPR,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt))),Ast.makeNode(CAstNode.ASSIGN,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeNode(CAstNode.OBJECT_REF,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant("String_Node_Str")))),get=Ast.makeNode(CAstNode.OBJECT_REF,Ast.makeNode(CAstNode.VAR,Ast.makeConstant(receiverTemp)),Ast.makeConstant(elt)));
  }
  nodeMap.put(Pair.make(root,context.key()),result);
  nodeMap.put(Pair.make(root,ExpanderKey.EXTRA),get);
  return result;
}