--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/AgdaInterface.agda	Tue Sep 08 18:38:08 2020 +0900
@@ -0,0 +1,15 @@
+record StackMethods {n m : Level } (a : Set n ) {t : Set m }(stackImpl : Set n ) : Set (m Level.⊔ n) where
+  field
+    push : stackImpl -> a -> (stackImpl -> t) -> t
+    pop  : stackImpl -> (stackImpl -> Maybe a -> t) -> t
+open StackMethods
+
+record Stack {n m : Level } (a : Set n ) {t : Set m } (si : Set n ) : Set (m Level.⊔ n) where
+  field
+    stack : si
+    stackMethods : StackMethods {n} {m} a {t} si
+  pushStack :  a -> (Stack a si -> t) -> t
+  pushStack d next = push (stackMethods ) (stack ) d (\s1 -> next (record {stack = s1 ; stackMethods = stackMethods } ))
+  popStack : (Stack a si -> Maybe a  -> t) -> t
+  popStack next = pop (stackMethods ) (stack ) (\s1 d1 -> next (record {stack = s1 ; stackMethods = stackMethods }) d1 )
+open Stack