--- a/src/parallel_execution/context.h	Thu Nov 24 16:29:46 2016 +0900
+++ b/src/parallel_execution/context.h	Thu Nov 24 20:22:17 2016 +0900
@@ -249,7 +249,7 @@
         enum Code clear;
         enum Code next;
     } Tree;
-    struct Traverse {
+    struct RedBlackTree {
         struct Node* root;
         struct Node* current; // reading node of original tree
         struct Node* previous; // parent of reading node of original tree
@@ -258,10 +258,10 @@
         struct Node* grandparent; 
         struct Stack* nodeStack;
         int result;
-    } Traverse;
+    } RedBlackTree;
     struct RotateTree {
         enum Code next;
-        struct Traverse* traverse;
+        struct RedBlackTree* traverse;
         struct Tree* tree;
     } rotateTree;
     struct Node {
@@ -300,7 +300,6 @@
 typedef struct Array Array;
 typedef struct RedBlackTree RedBlackTree;
 typedef struct Tree Tree;
-typedef struct Traverse Traverse;
 typedef struct RotateTree RotateTree;
 typedef struct Node Node;
 typedef struct Allocate Allocate;