--- a/src/proc.h	Fri Aug 02 19:36:19 2019 +0900
+++ b/src/proc.h	Wed Oct 09 20:41:51 2019 +0900
@@ -86,6 +86,28 @@
     struct spinlock *lk;
 };
 
+// typedef struct context_interface<Type,Imple>{
+//     // union Data* stack;
+//     // union Data* data;
+// 
+//     // __code push(Impl* stack,Type* data, __code next(...));
+//     // __code next(...);
+// 
+//     union Data* stack;
+//     union Data* data;
+//     union Data* data1;
+//     enum Code whenEmpty;
+//     enum Code clear;
+//     enum Code push;
+//     enum Code pop;
+//     enum Code pop2;
+//     enum Code isEmpty;
+//     enum Code get;
+//     enum Code get2;
+//     enum Code next;
+// }context_interface;
+
+
 // Process memory is laid out contiguously, low addresses first:
 //   text
 //   original data and bss