diff --git a/src/main/scala/fluence/hackethberlin/Expr.scala b/src/main/scala/fluence/hackethberlin/Expr.scala
new file mode 100644
index 0000000..a1d6024
--- /dev/null
+++ b/src/main/scala/fluence/hackethberlin/Expr.scala
@@ -0,0 +1,9 @@
+package fluence.hackethberlin
+
+sealed trait Expr[T <: types.Type] {
+  def toVyper(depth: Int): String
+}
+
+object Expr {
+  case class Ref[T]()
+}
diff --git a/src/main/scala/fluence/hackethberlin/MakeVyperApp.scala b/src/main/scala/fluence/hackethberlin/MakeVyperApp.scala
index c0fe658..b939ed3 100644
--- a/src/main/scala/fluence/hackethberlin/MakeVyperApp.scala
+++ b/src/main/scala/fluence/hackethberlin/MakeVyperApp.scala
@@ -3,35 +3,45 @@ package fluence.hackethberlin
 import shapeless._
 import types._
 import Decorator._
+import syntax.singleton._
 
 object MakeVyperApp extends App {
 
   val struct = new StructType(
-    ("address" → address) ::
-      ("owner" → address) ::
-      ("size" -> uint256) ::
-      ("time" -> int128) :: HNil
+    ('address ->> address) ::
+      ('owner ->> address) ::
+      ('size ->> uint256) ::
+      ('time ->> int128) :: HNil
   )
 
   val data = new DataDef(
-    ("address" → address) ::
-      ("owner" → `public`(address)) ::
-      ("holders" → (address ~>> bool)) ::
-      ("structMap" → `public`(uint256 ~>> struct)) ::
-      ("struct" → `public`(struct)) ::
-      ("struct2" → struct) :: HNil
+    ('address ->> address) ::
+      ('owner ->> `public`(address)) ::
+      ('holders ->> (address ~>> bool)) ::
+      ('structMap ->> `public`(uint256 ~>> struct)) ::
+      ('struct ->> `public`(struct)) ::
+      ('struct2 ->> struct) :: HNil
   )
 
   val func = FuncDef(
     "myFunc",
-    ("address" → address) :: HNil,
+    ('address ->> address) :: HNil,
     uint256
   )
 
+
+  val strDataDef = ('address ->> address) :: HNil
+
+  val recordStruct = new StructType(
+    ('record_address ->> address) :: ('other_some ->> uint256) :: HNil
+  )
+
+  println(recordStruct.toVyper)
+
   println(data.toVyper)
 
   println(func.toVyper)
 
   println((`@public` @: func).toVyper)
 
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/fluence/hackethberlin/types/DataVyper.scala b/src/main/scala/fluence/hackethberlin/types/DataVyper.scala
index 5ccb509..46c4788 100644
--- a/src/main/scala/fluence/hackethberlin/types/DataVyper.scala
+++ b/src/main/scala/fluence/hackethberlin/types/DataVyper.scala
@@ -1,6 +1,7 @@
 package fluence.hackethberlin.types
 
 import shapeless._
+import shapeless.labelled.FieldType
 import shapeless.tag._
 
 sealed trait DataVyper[T] {
@@ -22,12 +23,10 @@ sealed trait LowPriorityDataVyperImplicits {
         dh.toVyperDefinitions(data.head) ::: dt.toVyperDefinitions(data.tail)
     }
 
-  implicit def pairDataVyper[T <: Type]: DataVyper[(String, T)] =
-    new DataVyper[(String, T)] {
-      override def toVyperDefinitions(pair: (String, T)): List[String] = {
-        val (name, ttype) = pair
-        s"$name: ${ttype.toVyper}" :: Nil
-      }
+  implicit def recDataVyper[K <: Symbol, V <: Type](implicit wk: Witness.Aux[K]): DataVyper[FieldType[K, V]] =
+    new DataVyper[FieldType[K, V]]{
+      override def toVyperDefinitions(data: FieldType[K, V]): List[String] =
+        s"${wk.value.name}: ${data.toVyper}" :: Nil
     }
 }
 
@@ -35,20 +34,16 @@ object DataVyper extends LowPriorityDataVyperImplicits {
 
   def apply[T](implicit dataVyper: DataVyper[T]): DataVyper[T] = dataVyper
 
-  implicit def pairDataPublicVyper[T <: Type]: DataVyper[(String, T @@ Public)] =
-    new DataVyper[(String, T @@ Public)] {
-      override def toVyperDefinitions(pair: (String, T @@ Public)): List[String] = {
-        val (name, ttype) = pair
-        s"$name: public(${ttype.toVyper})" :: Nil
-      }
+  implicit def pairDataIndexedVyper[K <: Symbol, T <: Type](implicit wk: Witness.Aux[K]): DataVyper[FieldType[K, T @@ Indexed]] =
+    new DataVyper[FieldType[K, T @@ Indexed]] {
+      override def toVyperDefinitions(data: FieldType[K, T @@ Indexed]): List[String] =
+        s"${wk.value.name}: indexed(${data.toVyper})" :: Nil
     }
 
-  implicit def pairDataIndexedVyper[T <: Type]: DataVyper[(String, T @@ Indexed)] =
-    new DataVyper[(String, T @@ Indexed)] {
-      override def toVyperDefinitions(pair: (String, T @@ Indexed)): List[String] = {
-        val (name, ttype) = pair
-        s"$name: indexed(${ttype.toVyper})" :: Nil
-      }
+  implicit def pairDataPublicVyper[K <: Symbol, T <: Type](implicit wk: Witness.Aux[K]): DataVyper[FieldType[K, T @@ Public]] =
+    new DataVyper[FieldType[K, T @@ Public]] {
+      override def toVyperDefinitions(data: FieldType[K, T @@ Public]): List[String] =
+        s"${wk.value.name}: public(${data.toVyper})" :: Nil
     }
 
 }
diff --git a/src/main/scala/fluence/hackethberlin/types/StructType.scala b/src/main/scala/fluence/hackethberlin/types/StructType.scala
index 3420905..4d9d415 100644
--- a/src/main/scala/fluence/hackethberlin/types/StructType.scala
+++ b/src/main/scala/fluence/hackethberlin/types/StructType.scala
@@ -1,7 +1,7 @@
 package fluence.hackethberlin.types
 
-import shapeless.{HList, LUBConstraint}
+import shapeless.HList
 
-class StructType[D <: HList](dataDef: D)(implicit dv: DataVyper[D], c: LUBConstraint[D, (String, Type)]) extends Type {
+class StructType[D <: HList](dataDef: D)(implicit dv: DataVyper[D]) extends Type {
   override def toVyper: String = s"{${dv.toVyperDefinitions(dataDef).mkString(", ")}}"
 }