--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/paper/src/MetaMetaCodeSegment.agda	Fri Feb 03 11:59:41 2017 +0900
@@ -0,0 +1,30 @@
+...
+-- meta level
+liftContext : {X Y : Set} {{_ : N.DataSegment X}} {{_ : N.DataSegment Y}} -> N.CodeSegment X Y -> N.CodeSegment Context Context
+liftContext {{x}} {{y}} (N.cs f) = N.cs (\c -> N.DataSegment.set y c (f (N.DataSegment.get x c)))
+
+liftMeta : {X Y : Set} {{_ : M.DataSegment X}} {{_ : M.DataSegment Y}} -> N.CodeSegment X Y -> M.CodeSegment X Y
+liftMeta (N.cs f) = M.cs f
+
+gotoMeta : {I O : Set} {{_ : N.DataSegment I}} {{_ : N.DataSegment O}} -> M.CodeSegment Meta Meta -> N.CodeSegment I O -> Meta -> Meta
+gotoMeta mCode code m = M.exec mCode (record m {next = (liftContext code)})
+
+push : M.CodeSegment Meta Meta
+push = M.cs (\m -> M.exec (liftMeta (Meta.next m)) (record m {c' = Context.c (Meta.context m)}))
+
+-- normal level
+
+cs2 : N.CodeSegment ds1 ds1
+cs2 = N.cs id
+
+cs1 : N.CodeSegment ds1 ds1
+cs1 = N.cs (\d -> N.goto cs2 d)
+
+cs0 : N.CodeSegment ds0 ds1
+cs0 = N.cs (\d -> N.goto cs1 (record {c = (ds0.a d) + (ds0.b d)}))
+
+-- meta level (with extended normal)
+main : Meta
+main = gotoMeta push cs0 (record {context = (record {a = 100 ; b = 50 ; c = 70}) ; c' = 0 ; next = (N.cs id)})
+-- record {context = record {a = 100 ; b = 50 ; c = 150} ; c' = 70 ; next = (N.cs id)}
+