diff --git a/pkg/codegen/codegen.go b/pkg/codegen/codegen.go
index bdf5eef..7a3f322 100644
--- a/pkg/codegen/codegen.go
+++ b/pkg/codegen/codegen.go
@@ -178,6 +178,9 @@ func newStruct(
 ) value.Value {
 
 	structCtx := mTypes.GetExtendedType(ctx.prog.Declare, node)
+	if structCtx == nil {
+		log.Panic("%s: not found type: have %+v", error.ERROR_UNDEFINE, node)
+	}
 
 	// null pointer to struct: %struct* null
 	nullStructPtr := constant.NewNull(types.NewPointer(structCtx.Types))
@@ -203,15 +206,20 @@ func newStruct(
 		field := n
 		value := n.Child
 
-		namePtr := ctx.block.NewGetElementPtr(
+		fieldPtr := ctx.block.NewGetElementPtr(
 			structCtx.Types,
 			structPtr,
 			mTypes.I32zero,
 			constant.NewInt(types.I32, int64(structCtx.Field[field.Val].Pos)), // name field
 		)
 		v := ctx.gen(value)
-		ctx.block.NewStore(v, namePtr)
 
+		if _, ok := v.(*ir.InstBitCast); ok {
+			ctx.block.NewStore(nullStructPtr, fieldPtr)
+			ctx.block.NewStore(v, fieldPtr)
+		} else {
+			ctx.block.NewStore(v, fieldPtr)
+		}
 	}
 	return structPtr
 
@@ -334,6 +342,10 @@ func (ctx *Context) genStructTypeDeclare(node *mTypes.Node) {
 	for n := node.Child; n != nil; n = n.Next {
 		// Note: is NOT TRUE
 		rootTy, _, _ := mTypes.GetLLVMTypeRec(ctx.mod, n.Type, ctx.prog.Prelude)
+		// need to check others struct
+		if rootTy == nil && n.IsType(mTypes.TY_EXTENDED) && n.Type.ExtendName == node.Val {
+			rootTy = structType
+		}
 		f := structField[n.Val]
 		f.Pos = pos
 		if _, ok := rootTy.(*types.StructType); ok {
diff --git a/pkg/parser/parser.go b/pkg/parser/parser.go
index 23ecb94..83d0e57 100644
--- a/pkg/parser/parser.go
+++ b/pkg/parser/parser.go
@@ -256,6 +256,9 @@ func parseDeclare(tok *mTypes.Token, parentKind mTypes.NodeKind) (*mTypes.Token,
 					Val:  structElmeName,
 					Type: structElemType,
 				}
+				if structTy.IsType(mTypes.TY_EXTENDED) {
+					structTy.Type.ExtendName = tok.Val
+				}
 				child.Next = structTy
 				child = child.Next
 				tok = tok.Next
@@ -489,6 +492,22 @@ func Parse(token *mTypes.Token) *mTypes.Program {
 		updateReferenceToFunccall(d.Child, d, prog.Declare.Func)
 	}
 
+	// add extendedName to the child node of var.reference that have TY_EXTENDED
+	walkNode(prog.Declare.Func, prog.Declare.Func, map[string]bool{},
+		func(n *mTypes.Node, root *mTypes.Node, used map[string]bool) bool {
+			if n.IsKind(mTypes.ND_VAR_REFERENCE) && n.IsType(mTypes.TY_EXTENDED) {
+				decl := findTypeDeclare(root, n.Type.ExtendName)
+				if decl == nil {
+					log.Panic("%s: undefined type: %s", error.ERROR_SYNTAX_ERROR, n.Type.ExtendName)
+				}
+				if n.Child != nil {
+					n.Child.Type.ExtendName = n.Type.ExtendName
+				}
+			}
+			return true
+		},
+	)
+
 	prog.Debug(0)
 
 	log.DebugMessage("code validating")
diff --git a/pkg/types/node.go b/pkg/types/node.go
index cd1c053..bb0be8f 100644
--- a/pkg/types/node.go
+++ b/pkg/types/node.go
@@ -110,7 +110,7 @@ func (node *Node) IsKind(kind NodeKind) bool {
 }
 
 func (node *Node) IsType(ty ModoType) bool {
-	return node.Type.Value == ty
+	return node.Type != nil && node.Type.Value == ty
 }
 
 func (node *Node) IsScalar() bool {
diff --git a/script/test-full.sh b/script/test-full.sh
index d89426b..86aedd1 100755
--- a/script/test-full.sh
+++ b/script/test-full.sh
@@ -283,6 +283,7 @@ testexec(){
   assertexec '(defschema Person {:name :: string :age :: int :isMale :: bool :height :: double})(def main :: int (fn [] (let [node :: Person {:age 20 :name "richard" :isMale true :height 5.8}] (prn (get node :name)) (prn (get node :age)) (prn (get node :isMale)) (prn (get node :height))))))'  "richard\\\n20\\\ntrue\\\n5.8\\\n"
   assertexec '(defschema Person {:name :: string :age :: int :isMale :: bool}) (def f :: Person (fn [] (let [node :: Person {:age 20 :name "richard" :isMale true}] node))) (def main :: int (fn [] (prn (get f :age))))' "20\\\n"
   assertexec '(defschema Person {:name :: string :age :: int :isMale :: bool :height :: double :v :: [int]}) (def main :: int (fn [] (let [node :: Person {:age 20 :name "richard" :isMale true :height 5.8 :v [4, 3, 2]}] (prn (get node :name)) (prn (get node :age)) (prn (get node :isMale)) (prn (get node :height)) (prn (get node :v)) )))' "richard\\\n20\\\ntrue\\\n5.8\\\n[4, 3, 2]\\\n"
+  assertexec '(defschema Person {:name ::string :next ::Person})(def main ::int (fn [] (let [node ::Person {:name "richard" :next {:name "rebecca" :next {:name "andre" :next {:name "bob"}}}}] (prn (get node :name)) (prn (get (get node :next) :name)) (prn (get (get (get node :next) :next) :name)) (prn (get (get (get (get node :next) :next) :next) :name)))))' "richard\\\nrebecca\\\nandre\\\nbob\\\n"
 
   #############
   # Prelude functions