diff --git a/src/main/compile/of_typed.ml b/src/main/compile/of_typed.ml
index 43b2216fe..8bcbfd882 100644
--- a/src/main/compile/of_typed.ml
+++ b/src/main/compile/of_typed.ml
@@ -15,8 +15,8 @@ let assert_equal_contract_type : check_type -> string -> Ast_typed.program -> As
   | T_arrow {type1=args} -> (
       match args.type_content with
       | T_record m when LMap.cardinal m = 2 -> (
-        let param_exp = LMap.find (Label "0") m in
-        let storage_exp = LMap.find (Label "1") m in
+        let {field_type=param_exp;_} = LMap.find (Label "0") m in
+        let {field_type=storage_exp;_} = LMap.find (Label "1") m in
           match c with
           | Check_parameter -> assert_type_expression_eq (param_exp,   param.type_expression)
           | Check_storage   -> assert_type_expression_eq (storage_exp, param.type_expression)
diff --git a/src/passes/10-transpiler/transpiler.ml b/src/passes/10-transpiler/transpiler.ml
index 3949f34ff..f1a764953 100644
--- a/src/passes/10-transpiler/transpiler.ml
+++ b/src/passes/10-transpiler/transpiler.ml
@@ -298,6 +298,19 @@ let rec transpile_type (t:AST.type_expression) : type_value result =
                         ok (Some (String.uncapitalize_ascii ann), a))
                       aux node in
       ok @@ snd m'
+  | T_record m when Ast_typed.Helpers.is_michelson_pair m ->
+      let node = Append_tree.of_list @@ Ast_typed.Helpers.tuple_of_record m in
+      let aux a b : type_value annotated result =
+        let%bind a = a in
+        let%bind b = b in
+        ok (None, T_pair (a, b))
+      in
+      let%bind m' = Append_tree.fold_ne
+                      (fun (_, ({field_type ; michelson_annotation} : AST.field_content)) ->
+                        let%bind a = transpile_type field_type in
+                        ok (michelson_annotation, a) )
+                      aux node in
+      ok @@ snd m'
   | T_record m ->
       let is_tuple_lmap = Ast_typed.Helpers.is_tuple_lmap m in
       let node = Append_tree.of_list @@ (
@@ -313,8 +326,8 @@ let rec transpile_type (t:AST.type_expression) : type_value result =
         ok (None, T_pair (a, b))
       in
       let%bind m' = Append_tree.fold_ne
-                      (fun (Ast_typed.Types.Label ann, a) ->
-                        let%bind a = transpile_type a in                        
+                      (fun (Ast_typed.Types.Label ann, ({field_type;_}: AST.field_content)) ->
+                        let%bind a = transpile_type field_type in
                         ok ((if is_tuple_lmap then 
                               None 
                             else 
@@ -448,7 +461,7 @@ and transpile_annotated_expression (ae:AST.expression) : expression result =
       let%bind ty_lmap =
         trace_strong (corner_case ~loc:__LOC__ "not a record") @@
         get_t_record (get_type_expression record) in
-      let%bind ty'_lmap = Ast_typed.Helpers.bind_map_lmap transpile_type ty_lmap in
+      let%bind ty'_lmap = Ast_typed.Helpers.bind_map_lmap_t transpile_type ty_lmap in
       let%bind path =
         trace_strong (corner_case ~loc:__LOC__ "record access") @@
         record_access_to_lr ty' ty'_lmap path in
@@ -465,7 +478,7 @@ and transpile_annotated_expression (ae:AST.expression) : expression result =
       let%bind ty_lmap =
         trace_strong (corner_case ~loc:__LOC__ "not a record") @@
         get_t_record (get_type_expression record) in
-      let%bind ty'_lmap = Ast_typed.Helpers.bind_map_lmap transpile_type ty_lmap in
+      let%bind ty'_lmap = Ast_typed.Helpers.bind_map_lmap_t transpile_type ty_lmap in
       let%bind path = 
         trace_strong (corner_case ~loc:__LOC__ "record access") @@
         record_access_to_lr ty' ty'_lmap path in
diff --git a/src/passes/10-transpiler/untranspiler.ml b/src/passes/10-transpiler/untranspiler.ml
index a727eedff..bf59c6a81 100644
--- a/src/passes/10-transpiler/untranspiler.ml
+++ b/src/passes/10-transpiler/untranspiler.ml
@@ -231,7 +231,7 @@ let rec untranspile (v : value) (t : AST.type_expression) : AST.expression resul
       let%bind sub = untranspile v tv in
       return (E_constructor {constructor=Constructor name;element=sub})
   | T_record m ->
-      let lst = Ast_typed.Helpers.kv_list_of_record_or_tuple m in
+      let lst = List.map (fun (k,{field_type;_}) -> (k,field_type)) @@ Ast_typed.Helpers.kv_list_of_record_or_tuple m in
       let%bind node = match Append_tree.of_list lst with
         | Empty -> fail @@ corner_case ~loc:__LOC__ "empty record"
         | Full t -> ok t in
diff --git a/src/passes/2-concrete_to_imperative/pascaligo.ml b/src/passes/2-concrete_to_imperative/pascaligo.ml
index e0bccd831..ca3139655 100644
--- a/src/passes/2-concrete_to_imperative/pascaligo.ml
+++ b/src/passes/2-concrete_to_imperative/pascaligo.ml
@@ -182,6 +182,21 @@ let rec compile_type_expression (t:Raw.type_expr) : type_expression result =
             ok @@ t_michelson_or ~loc a' b' c' d'
             )
           | _ -> simple_fail "michelson_or does not have the right number of argument")
+        | "michelson_pair" ->
+          let lst = npseq_to_list tuple.value.inside in
+          (match lst with
+          | [a ; b ; c ; d ] -> (
+            let%bind b' =
+              trace_option (simple_error "second argument of michelson_pair must be a string singleton") @@
+                get_t_string_singleton_opt b in
+            let%bind d' =
+              trace_option (simple_error "fourth argument of michelson_pair must be a string singleton") @@
+                get_t_string_singleton_opt d in
+            let%bind a' = compile_type_expression a in
+            let%bind c' = compile_type_expression c in
+            ok @@ t_michelson_pair ~loc a' b' c' d'
+            )
+          | _ -> simple_fail "michelson_or does not have the right number of argument")
         | _ ->
           let lst = npseq_to_list tuple.value.inside in
           let%bind lst =
diff --git a/src/passes/4-imperative_to_sugar/imperative_to_sugar.ml b/src/passes/4-imperative_to_sugar/imperative_to_sugar.ml
index 5f7240b41..318fe942d 100644
--- a/src/passes/4-imperative_to_sugar/imperative_to_sugar.ml
+++ b/src/passes/4-imperative_to_sugar/imperative_to_sugar.ml
@@ -129,7 +129,8 @@ let rec compile_type_expression : I.type_expression -> O.type_expression result
       let%bind record = 
         bind_map_list (fun (k,v) ->
           let%bind v = compile_type_expression v in
-          ok @@ (k,v)
+          let content : O.field_content = {field_type = v ; michelson_annotation = None} in
+          ok @@ (k,content)
         ) record
       in
       return @@ O.T_record (O.LMap.of_list record)
@@ -149,6 +150,13 @@ let rec compile_type_expression : I.type_expression -> O.type_expression result
         (O.Constructor "M_right", {ctor_type = r ; michelson_annotation = Some r_ann}); ]
       in
       return @@ O.T_sum (O.CMap.of_list sum)
+    | I.T_operator (TC_michelson_pair (l,l_ann,r,r_ann)) ->
+      let%bind (l,r) = bind_map_pair compile_type_expression (l,r) in
+      let sum : (O.label * O.field_content) list = [
+        (O.Label "M_left" , {field_type = l ; michelson_annotation = Some l_ann}); 
+        (O.Label "M_right", {field_type = r ; michelson_annotation = Some r_ann}); ]
+      in
+      return @@ O.T_record (O.LMap.of_list sum)
     | I.T_operator type_operator ->
       let%bind type_operator = compile_type_operator type_operator in
       return @@ T_operator type_operator
@@ -177,7 +185,7 @@ and compile_type_operator : I.type_operator -> O.type_operator result =
     | TC_arrow (i,o) ->
       let%bind (i,o) = bind_map_pair compile_type_expression (i,o) in
       ok @@ O.TC_arrow (i,o)
-    | TC_michelson_or _ -> fail @@ Errors.corner_case __LOC__
+    | TC_michelson_or _ | TC_michelson_pair _ -> fail @@ Errors.corner_case __LOC__
 
 let rec compile_expression : I.expression -> O.expression result =
   fun e ->
@@ -587,7 +595,8 @@ let rec uncompile_type_expression : O.type_expression -> I.type_expression resul
       let record = I.LMap.to_kv_list record in
       let%bind record = 
         bind_map_list (fun (k,v) ->
-          let%bind v = uncompile_type_expression v in
+          let {field_type;_} : O.field_content = v in
+          let%bind v = uncompile_type_expression field_type in
           ok @@ (k,v)
         ) record
       in
diff --git a/src/passes/5-self_ast_sugar/helpers.ml b/src/passes/5-self_ast_sugar/helpers.ml
index 4559e0429..0d3b353b7 100644
--- a/src/passes/5-self_ast_sugar/helpers.ml
+++ b/src/passes/5-self_ast_sugar/helpers.ml
@@ -9,6 +9,13 @@ let bind_map_cmap f map = bind_cmap (
       ok {ctor with ctor_type = ctor'}) 
     map)
 
+let bind_map_lmap_t f map = bind_lmap (
+  LMap.map 
+    (fun ({field_type;_} as field) -> 
+      let%bind field' = f field_type in
+      ok {field with field_type = field'}) 
+    map)
+
 type 'a folder = 'a -> expression -> 'a result
 let rec fold_expression : 'a folder -> 'a -> expression -> 'a result = fun f init e ->
   let self = fold_expression f in 
@@ -234,7 +241,7 @@ and map_type_expression : ty_exp_mapper -> type_expression -> type_expression re
     let%bind temap' = bind_map_cmap self temap in
     return @@ (T_sum temap')
   | T_record temap ->
-    let%bind temap' = bind_map_lmap self temap in
+    let%bind temap' = bind_map_lmap_t self temap in
     return @@ (T_record temap')
   | T_tuple telst ->
     let%bind telst' = bind_map_list self telst in
diff --git a/src/passes/6-sugar_to_core/sugar_to_core.ml b/src/passes/6-sugar_to_core/sugar_to_core.ml
index 97e8ea2e2..ce1af8ae2 100644
--- a/src/passes/6-sugar_to_core/sugar_to_core.ml
+++ b/src/passes/6-sugar_to_core/sugar_to_core.ml
@@ -21,15 +21,17 @@ let rec idle_type_expression : I.type_expression -> O.type_expression result =
       let record = I.LMap.to_kv_list record in
       let%bind record = 
         bind_map_list (fun (k,v) ->
-          let%bind v = idle_type_expression v in
-          ok @@ (k,v)
+          let {field_type ; michelson_annotation} : I.field_content = v in
+          let%bind field_type = idle_type_expression field_type in
+          let v' : O.field_content = {field_type ; field_annotation=michelson_annotation} in
+          ok @@ (k,v')
         ) record
       in
       return @@ O.T_record (O.LMap.of_list record)
     | I.T_tuple tuple ->
       let aux (i,acc) el = 
         let%bind el = idle_type_expression el in
-        ok @@ (i+1,(O.Label (string_of_int i), el)::acc) in
+        ok @@ (i+1,(O.Label (string_of_int i), ({field_type=el;field_annotation=None}:O.field_content))::acc) in
       let%bind (_, lst ) = bind_fold_list aux (0,[]) tuple in
       let record = O.LMap.of_list lst in
       return @@ O.T_record record
@@ -254,8 +256,10 @@ let rec uncompile_type_expression : O.type_expression -> I.type_expression resul
       let record = I.LMap.to_kv_list record in
       let%bind record = 
         bind_map_list (fun (k,v) ->
-          let%bind v = uncompile_type_expression v in
-          ok @@ (k,v)
+          let {field_type;field_annotation} : O.field_content = v in
+          let%bind field_type = uncompile_type_expression field_type in
+          let v' : I.field_content = {field_type;michelson_annotation=field_annotation} in
+          ok @@ (k,v')
         ) record
       in
       return @@ I.T_record (O.LMap.of_list record)
diff --git a/src/passes/7-self_ast_core/helpers.ml b/src/passes/7-self_ast_core/helpers.ml
index b133faef4..e76e4f064 100644
--- a/src/passes/7-self_ast_core/helpers.ml
+++ b/src/passes/7-self_ast_core/helpers.ml
@@ -12,6 +12,13 @@ let bind_map_cmap f map = bind_cmap (
       ok {ctor with ctor_type = ctor'}) 
     map)
 
+let bind_map_lmap_t f map = bind_lmap (
+  LMap.map 
+    (fun ({field_type;_} as field) -> 
+      let%bind field' = f field_type in
+      ok {field with field_type = field'}) 
+    map)
+
 type 'a folder = 'a -> expression -> 'a result
 let rec fold_expression : 'a folder -> 'a -> expression -> 'a result = fun f init e ->
   let self = fold_expression f in 
@@ -161,7 +168,7 @@ and map_type_expression : ty_exp_mapper -> type_expression -> type_expression re
     let%bind temap' = bind_map_cmap self temap in
     return @@ (T_sum temap')
   | T_record temap ->
-    let%bind temap' = bind_map_lmap self temap in
+    let%bind temap' = bind_map_lmap_t self temap in
     return @@ (T_record temap')
   | T_arrow {type1 ; type2} ->
     let%bind type1' = self type1 in
diff --git a/src/passes/8-typer-new/typer.ml b/src/passes/8-typer-new/typer.ml
index 1d602f458..71ec621c2 100644
--- a/src/passes/8-typer-new/typer.ml
+++ b/src/passes/8-typer-new/typer.ml
@@ -147,8 +147,9 @@ and evaluate_type (e:environment) (t:I.type_expression) : O.type_expression resu
   | T_record m ->
     let aux k v prev =
       let%bind prev' = prev in
-      let%bind v' = evaluate_type e v in
-      ok @@ O.LMap.add (convert_label k) v' prev'
+      let {field_type ; field_annotation} : I.field_content = v in
+      let%bind field_type = evaluate_type e field_type in
+      ok @@ O.LMap.add (convert_label k) ({field_type ; michelson_annotation=field_annotation}:O.field_content) prev'
     in
     let%bind m = I.LMap.fold aux m (ok O.LMap.empty) in
     return (T_record m)
@@ -311,7 +312,7 @@ and type_expression : environment -> Solver.state -> ?tv_opt:O.type_expression -
       ok (O.LMap.add (convert_label k) expr' acc , state')
     in
     let%bind (m' , state') = Stage_common.Helpers.bind_fold_lmap aux (ok (O.LMap.empty , state)) m in
-    let wrapped = Wrap.record (O.LMap.map get_type_expression m') in
+    let wrapped = Wrap.record (O.LMap.map (fun e -> ({field_type = get_type_expression e ; michelson_annotation = None}: O.field_content)) m') in
     return_wrapped (E_record m') state' wrapped
   | E_record_update {record; path; update} ->
     let%bind (record, state) = type_expression e state record in
@@ -323,7 +324,7 @@ and type_expression : environment -> Solver.state -> ?tv_opt:O.type_expression -
       | T_record record -> (
           let field_op = O.LMap.find_opt path record in
           match field_op with
-          | Some tv -> ok (record,tv)
+          | Some {field_type=tv;_} -> ok (record,tv)
           | None -> failwith @@ Format.asprintf "field %a is not part of record" O.PP.label path
       )
       | _ -> failwith "Update an expression which is not a record"
diff --git a/src/passes/8-typer-new/untyper.ml b/src/passes/8-typer-new/untyper.ml
index 0d3c56162..f082bd072 100644
--- a/src/passes/8-typer-new/untyper.ml
+++ b/src/passes/8-typer-new/untyper.ml
@@ -157,9 +157,10 @@ let rec untype_type_expression (t:O.type_expression) : (I.type_expression) resul
     let%bind x' = O.CMap.fold aux x (ok I.CMap.empty) in
     ok @@ I.T_sum x'
   | O.T_record x ->
-    let aux k v acc =
+    let aux k ({field_type ; michelson_annotation} : O.field_content) acc =
       let%bind acc = acc in
-      let%bind v' = untype_type_expression v in
+      let%bind field_type = untype_type_expression field_type in
+      let v' = ({field_type ; field_annotation=michelson_annotation} : I.field_content) in
       ok @@ I.LMap.add (unconvert_label k) v' acc in
     let%bind x' = O.LMap.fold aux x (ok I.LMap.empty) in
     ok @@ I.T_record x'
diff --git a/src/passes/8-typer-new/wrap.ml b/src/passes/8-typer-new/wrap.ml
index 5355e7bc8..f51a38140 100644
--- a/src/passes/8-typer-new/wrap.ml
+++ b/src/passes/8-typer-new/wrap.ml
@@ -38,7 +38,8 @@ let rec type_expression_to_type_value : T.type_expression -> O.type_value = fun
      P_constant (C_variant, List.map type_expression_to_type_value tlist)
   | T_record kvmap ->
      let () = failwith "fixme: don't use to_list, it drops the record keys, rows have a differnt kind than argument lists for now!" in
-     P_constant (C_record, T.LMap.to_list @@ T.LMap.map type_expression_to_type_value kvmap)
+     let tlist = List.map (fun ({field_type;_}:T.field_content) -> field_type) (T.LMap.to_list kvmap) in
+     P_constant (C_record, List.map type_expression_to_type_value tlist)
   | T_arrow {type1;type2} ->
      P_constant (C_arrow, List.map type_expression_to_type_value [ type1 ; type2 ])
 
@@ -85,7 +86,8 @@ let rec type_expression_to_type_value_copypasted : I.type_expression -> O.type_v
      P_constant (C_variant, List.map type_expression_to_type_value_copypasted tlist)
   | T_record kvmap ->
      let () = failwith "fixme: don't use to_list, it drops the record keys, rows have a differnt kind than argument lists for now!" in
-     P_constant (C_record, I.LMap.to_list @@ I.LMap.map type_expression_to_type_value_copypasted kvmap)
+     let tlist = List.map (fun ({field_type;_}:I.field_content) -> field_type) (I.LMap.to_list kvmap) in
+     P_constant (C_record, List.map type_expression_to_type_value_copypasted tlist)
   | T_arrow {type1;type2} ->
      P_constant (C_arrow, List.map type_expression_to_type_value_copypasted [ type1 ; type2 ])
   | T_variable type_name -> P_variable (type_name) (* eird stuff*)
@@ -184,7 +186,7 @@ let constructor
     C_equation (t_arg , c_arg)
   ] , whole_expr
 
-let record : T.type_expression T.label_map -> (constraints * T.type_variable) = fun fields ->
+let record : T.field_content T.label_map -> (constraints * T.type_variable) = fun fields ->
   let record_type = type_expression_to_type_value (T.t_record fields ()) in
   let whole_expr = Core.fresh_type_variable () in
   [C_equation (P_variable whole_expr , record_type)] , whole_expr
diff --git a/src/passes/8-typer-old/typer.ml b/src/passes/8-typer-old/typer.ml
index d1ab5fbb2..7d2a70d8e 100644
--- a/src/passes/8-typer-old/typer.ml
+++ b/src/passes/8-typer-old/typer.ml
@@ -611,9 +611,10 @@ and evaluate_type (e:environment) (t:I.type_expression) : O.type_expression resu
       let%bind m = I.CMap.fold aux m (ok O.CMap.empty) in
       return (T_sum m)
   | T_record m ->
-      let aux k v prev =
+      let aux k ({field_type;field_annotation}: I.field_content) prev =
         let%bind prev' = prev in
-        let%bind v' = evaluate_type e v in
+        let%bind field_type = evaluate_type e field_type in
+        let v' = ({field_type;michelson_annotation=field_annotation} : O.field_content) in
         ok @@ O.LMap.add (convert_label k) v' prev'
       in
       let%bind m = I.LMap.fold aux m (ok O.LMap.empty) in
@@ -724,7 +725,7 @@ and type_expression' : environment -> ?tv_opt:O.type_expression -> I.expression
             let%bind r_tv = get_t_record prev.type_expression in
             let%bind tv =
               generic_try (bad_record_access property ae prev.type_expression ae.location)
-              @@ (fun () -> O.LMap.find (convert_label property) r_tv) in
+              @@ (fun () -> let ({field_type;_} : O.field_content) = O.LMap.find (convert_label property) r_tv in field_type) in
             let location = ae.location in
             ok @@ make_e ~location (E_record_accessor {record=prev; path=convert_label property}) tv e
       in
@@ -771,7 +772,8 @@ and type_expression' : environment -> ?tv_opt:O.type_expression -> I.expression
         ok (O.LMap.add (convert_label k) expr' prev)
       in
       let%bind m' = Stage_common.Helpers.bind_fold_lmap aux (ok O.LMap.empty) m in
-      return (E_record m') (t_record (O.LMap.map get_type_expression m') ())
+      let lmap = O.LMap.map (fun e -> ({field_type = get_type_expression e; michelson_annotation = None}:O.field_content)) m' in
+      return (E_record m') (t_record lmap ())
   | E_record_update {record; path; update} ->
     let path = convert_label path in
     let%bind record = type_expression' e record in
@@ -782,7 +784,7 @@ and type_expression' : environment -> ?tv_opt:O.type_expression -> I.expression
       | T_record record -> (
           let field_op = O.LMap.find_opt path record in
           match field_op with
-          | Some tv -> ok (tv)
+          | Some {field_type;_} -> ok field_type
           | None -> failwith @@ Format.asprintf "field %a is not part of record %a" Ast_typed.PP.label path O.PP.type_expression wrapped
       )
       | _ -> failwith "Update an expression which is not a record"
diff --git a/src/passes/9-self_ast_typed/no_nested_big_map.ml b/src/passes/9-self_ast_typed/no_nested_big_map.ml
index 8f8f9d51e..710f1b3e4 100644
--- a/src/passes/9-self_ast_typed/no_nested_big_map.ml
+++ b/src/passes/9-self_ast_typed/no_nested_big_map.ml
@@ -45,7 +45,7 @@ let rec check_no_nested_bigmap is_in_bigmap e =
     ok ()
   | T_record elm -> 
     let es = LMap.to_list elm in
-    let%bind _ = bind_map_list (fun l -> check_no_nested_bigmap is_in_bigmap l) es in
+    let%bind _ = bind_map_list (fun {field_type;_} -> check_no_nested_bigmap is_in_bigmap field_type) es in
     ok ()
   | T_arrow { type1; type2 } -> 
     let%bind _ = check_no_nested_bigmap false type1 in    
diff --git a/src/stages/1-ast_imperative/PP.ml b/src/stages/1-ast_imperative/PP.ml
index da65ae284..0b9827d4a 100644
--- a/src/stages/1-ast_imperative/PP.ml
+++ b/src/stages/1-ast_imperative/PP.ml
@@ -13,6 +13,12 @@ let cmap_sep value sep ppf m =
 
 let cmap_sep_d x = cmap_sep x (tag " ,@ ")
 
+let record_sep value sep ppf (m : 'a label_map) =
+  let lst = LMap.to_kv_list m in
+  let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
+  let new_pp ppf (k, v) = fprintf ppf "@[<h>%a -> %a@]" label k value v in
+  fprintf ppf "%a" (list_sep new_pp sep) lst
+
 let expression_variable ppf (ev : expression_variable) : unit =
   fprintf ppf "%a" Var.pp ev
 
@@ -48,6 +54,7 @@ and type_operator :
     | TC_map (k, v) -> Format.asprintf "Map (%a,%a)" f k f v
     | TC_big_map (k, v) -> Format.asprintf "Big Map (%a,%a)" f k f v
     | TC_michelson_or (l,_, r,_) -> Format.asprintf "Michelson_or (%a,%a)" f l f r
+    | TC_michelson_pair (l,_, r,_) -> Format.asprintf "Michelson_pair (%a,%a)" f l f r
     | TC_arrow (k, v) -> Format.asprintf "arrow (%a,%a)" f k f v
     | TC_contract te  -> Format.asprintf "Contract (%a)" f te
   in
diff --git a/src/stages/1-ast_imperative/combinators.ml b/src/stages/1-ast_imperative/combinators.ml
index e8db1428f..a7bb20945 100644
--- a/src/stages/1-ast_imperative/combinators.ml
+++ b/src/stages/1-ast_imperative/combinators.ml
@@ -62,6 +62,7 @@ let t_big_map ?loc key value     : type_expression = make_t ?loc @@ T_operator (
 let t_set ?loc key               : type_expression = make_t ?loc @@ T_operator (TC_set key)
 let t_contract ?loc contract     : type_expression = make_t ?loc @@ T_operator (TC_contract contract)
 let t_michelson_or ?loc l l_ann r r_ann : type_expression = make_t ?loc @@ T_operator (TC_michelson_or (l, l_ann, r, r_ann))
+let t_michelson_pair ?loc l l_ann r r_ann : type_expression = make_t ?loc @@ T_operator (TC_michelson_pair (l, l_ann, r, r_ann))
 
 (* TODO find a better way than using list*)
 let t_operator ?loc op lst: type_expression result =
diff --git a/src/stages/1-ast_imperative/combinators.mli b/src/stages/1-ast_imperative/combinators.mli
index 39f0fb3f5..50105895a 100644
--- a/src/stages/1-ast_imperative/combinators.mli
+++ b/src/stages/1-ast_imperative/combinators.mli
@@ -42,10 +42,10 @@ val ez_t_sum : ?loc:Location.t -> ( string * type_expression ) list -> type_expr
 
 val t_function : ?loc:Location.t -> type_expression -> type_expression -> type_expression
 val t_map      : ?loc:Location.t -> type_expression -> type_expression -> type_expression
-val t_michelson_or : ?loc:Location.t ->
-type_expression ->
-michelson_prct_annotation ->
-type_expression -> michelson_prct_annotation -> type_expression
+val t_michelson_or : ?loc:Location.t -> type_expression -> michelson_prct_annotation ->
+  type_expression -> michelson_prct_annotation -> type_expression
+val t_michelson_pair : ?loc:Location.t -> type_expression -> michelson_prct_annotation ->
+  type_expression -> michelson_prct_annotation -> type_expression
 
 val t_operator : ?loc:Location.t -> type_operator -> type_expression list -> type_expression result
 val t_set      : ?loc:Location.t -> type_expression -> type_expression
diff --git a/src/stages/1-ast_imperative/types.ml b/src/stages/1-ast_imperative/types.ml
index 8cdc8c6eb..49909998e 100644
--- a/src/stages/1-ast_imperative/types.ml
+++ b/src/stages/1-ast_imperative/types.ml
@@ -24,8 +24,9 @@ and type_operator =
   | TC_set of type_expression
   | TC_map of type_expression * type_expression
   | TC_big_map of type_expression * type_expression
-  | TC_michelson_or of type_expression * michelson_prct_annotation * type_expression * michelson_prct_annotation
   | TC_arrow of type_expression * type_expression
+  | TC_michelson_or of type_expression * michelson_prct_annotation * type_expression * michelson_prct_annotation
+  | TC_michelson_pair of type_expression * michelson_prct_annotation * type_expression * michelson_prct_annotation
 
 and type_expression = {type_content: type_content; location: Location.t}
 
diff --git a/src/stages/2-ast_sugar/PP.ml b/src/stages/2-ast_sugar/PP.ml
index 4375d1db3..22f726ff6 100644
--- a/src/stages/2-ast_sugar/PP.ml
+++ b/src/stages/2-ast_sugar/PP.ml
@@ -14,6 +14,13 @@ let cmap_sep value sep ppf m =
 
 let cmap_sep_d x = cmap_sep x (tag " ,@ ")
 
+let record_sep_t value sep ppf (m : 'a label_map) =
+  let lst = LMap.to_kv_list m in
+  let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
+  let new_pp ppf (k, {field_type;_}) = fprintf ppf "@[<h>%a -> %a@]" label k value field_type in
+  fprintf ppf "%a" (list_sep new_pp sep) lst
+
+
 let expression_variable ppf (ev : expression_variable) : unit =
   fprintf ppf "%a" Var.pp ev
 
@@ -25,7 +32,7 @@ let rec type_expression' :
   fun f ppf te ->
   match te.type_content with
   | T_sum m -> fprintf ppf "@[<hv 4>sum[%a]@]" (cmap_sep_d f) m
-  | T_record m -> fprintf ppf "{%a}" (record_sep f (const ";")) m
+  | T_record m -> fprintf ppf "{%a}" (record_sep_t f (const ";")) m
   | T_tuple  t -> fprintf ppf "(%a)" (list_sep_d f) t
   | T_arrow  a -> fprintf ppf "%a -> %a" f a.type1 f a.type2
   | T_variable tv -> type_variable ppf tv
@@ -65,7 +72,7 @@ and expression_content ppf (ec : expression_content) =
       fprintf ppf "%a(%a)" constant c.cons_name (list_sep_d expression)
         c.arguments
   | E_record m ->
-      fprintf ppf "{%a}" (record_sep expression (const ";")) m
+      fprintf ppf "{%a}" (record_sep_expr expression (const ";")) m
   | E_record_accessor ra ->
       fprintf ppf "%a.%a" expression ra.record label ra.path
   | E_record_update {record; path; update} ->
diff --git a/src/stages/2-ast_sugar/combinators.ml b/src/stages/2-ast_sugar/combinators.ml
index 60c2758da..99f4072b5 100644
--- a/src/stages/2-ast_sugar/combinators.ml
+++ b/src/stages/2-ast_sugar/combinators.ml
@@ -51,7 +51,9 @@ let t_record ?loc m  : type_expression =
   let lst = Map.String.to_kv_list m in
   t_record_ez ?loc lst
 
-let t_pair ?loc (a , b) : type_expression = t_record_ez ?loc [("0",a) ; ("1",b)]
+let t_pair ?loc (a , b) : type_expression = t_record_ez ?loc [
+  ("0",{field_type=a;michelson_annotation=None}) ;
+  ("1",{field_type=b;michelson_annotation=None})]
 let t_tuple ?loc lst    : type_expression = t_record_ez ?loc (tuple_to_record lst)
 
 let ez_t_sum ?loc (lst:((string * ctor_content) list)) : type_expression =
diff --git a/src/stages/2-ast_sugar/combinators.mli b/src/stages/2-ast_sugar/combinators.mli
index e83a307ef..c91279fa9 100644
--- a/src/stages/2-ast_sugar/combinators.mli
+++ b/src/stages/2-ast_sugar/combinators.mli
@@ -32,10 +32,10 @@ val t_variable  : ?loc:Location.t -> string -> type_expression
 val t_record    : te_map -> type_expression
 *)
 val t_pair   : ?loc:Location.t -> ( type_expression * type_expression ) -> type_expression
-val t_tuple  : ?loc:Location.t -> type_expression list -> type_expression
+val t_tuple  : ?loc:Location.t -> field_content list -> type_expression
 
-val t_record    : ?loc:Location.t -> type_expression Map.String.t -> type_expression
-val t_record_ez : ?loc:Location.t -> (string * type_expression) list -> type_expression
+val t_record    : ?loc:Location.t -> field_content Map.String.t -> type_expression
+val t_record_ez : ?loc:Location.t -> (string * field_content) list -> type_expression
 
 val t_sum    : ?loc:Location.t -> ctor_content Map.String.t -> type_expression
 val ez_t_sum : ?loc:Location.t -> ( string * ctor_content ) list -> type_expression
diff --git a/src/stages/2-ast_sugar/types.ml b/src/stages/2-ast_sugar/types.ml
index 4e673d1b5..18295b7a5 100644
--- a/src/stages/2-ast_sugar/types.ml
+++ b/src/stages/2-ast_sugar/types.ml
@@ -10,7 +10,7 @@ end
 
 type type_content =
   | T_sum of ctor_content constructor_map
-  | T_record of type_expression label_map
+  | T_record of field_content label_map
   | T_tuple  of type_expression list
   | T_arrow of arrow
   | T_variable of type_variable
@@ -21,6 +21,8 @@ and arrow = {type1: type_expression; type2: type_expression}
 
 and ctor_content = {ctor_type : type_expression ; michelson_annotation : string option}
 
+and field_content = {field_type : type_expression ; michelson_annotation : string option}
+
 and type_operator =
   | TC_contract of type_expression
   | TC_option of type_expression
diff --git a/src/stages/3-ast_core/combinators.mli b/src/stages/3-ast_core/combinators.mli
index 631c36110..9a857b0f7 100644
--- a/src/stages/3-ast_core/combinators.mli
+++ b/src/stages/3-ast_core/combinators.mli
@@ -31,11 +31,11 @@ val t_variable  : ?loc:Location.t -> string -> type_expression
 (*
 val t_record    : te_map -> type_expression
 *)
-val t_pair   : ?loc:Location.t -> ( type_expression * type_expression ) -> type_expression
-val t_tuple  : ?loc:Location.t -> type_expression list -> type_expression
+val t_pair   : ?loc:Location.t -> ( field_content * field_content ) -> type_expression
+val t_tuple  : ?loc:Location.t -> field_content list -> type_expression
 
-val t_record    : ?loc:Location.t -> type_expression Map.String.t -> type_expression
-val t_record_ez : ?loc:Location.t -> (string * type_expression) list -> type_expression
+val t_record    : ?loc:Location.t -> field_content Map.String.t -> type_expression
+val t_record_ez : ?loc:Location.t -> (string * field_content) list -> type_expression
 
 val t_sum    : ?loc:Location.t -> Types.ctor_content Map.String.t -> type_expression
 val ez_t_sum : ?loc:Location.t -> ( string * Types.ctor_content ) list -> type_expression
diff --git a/src/stages/4-ast_typed/PP.ml b/src/stages/4-ast_typed/PP.ml
index 4b93422e3..25905b310 100644
--- a/src/stages/4-ast_typed/PP.ml
+++ b/src/stages/4-ast_typed/PP.ml
@@ -31,6 +31,18 @@ let tuple_sep value sep ppf m =
   let new_pp ppf (_, v) = fprintf ppf "%a" value v in
   fprintf ppf "%a" (list_sep new_pp sep) lst
 
+let record_sep_t value sep ppf (m : 'a label_map) =
+  let lst = LMap.to_kv_list m in
+  let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
+  let new_pp ppf (k, {field_type;_}) = fprintf ppf "@[<h>%a -> %a@]" label k value field_type in
+  fprintf ppf "%a" (list_sep new_pp sep) lst
+
+let tuple_sep_t value sep ppf m =
+  assert (Helpers.is_tuple_lmap m);
+  let lst = Helpers.tuple_of_record m in
+  let new_pp ppf (_, {field_type;_}) = fprintf ppf "%a" value field_type in
+  fprintf ppf "%a" (list_sep new_pp sep) lst
+
 (* Prints records which only contain the consecutive fields
    0..(cardinal-1) as tuples *)
 let tuple_or_record_sep value format_record sep_record format_tuple sep_tuple ppf m =
@@ -38,11 +50,16 @@ let tuple_or_record_sep value format_record sep_record format_tuple sep_tuple pp
     fprintf ppf format_tuple (tuple_sep value (tag sep_tuple)) m
   else
     fprintf ppf format_record (record_sep value (tag sep_record)) m
+let tuple_or_record_sep_t value format_record sep_record format_tuple sep_tuple ppf m =
+  if Helpers.is_tuple_lmap m then
+    fprintf ppf format_tuple (tuple_sep_t value (tag sep_tuple)) m
+  else
+    fprintf ppf format_record (record_sep_t value (tag sep_record)) m
 
 let list_sep_d x = list_sep x (tag " ,@ ")
 let cmap_sep_d x = cmap_sep x (tag " ,@ ")
 let tuple_or_record_sep_expr value = tuple_or_record_sep value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " ,@ "
-let tuple_or_record_sep_type value = tuple_or_record_sep value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " *@ "
+let tuple_or_record_sep_type value = tuple_or_record_sep_t value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " *@ "
 
 let constant ppf : constant' -> unit = function
   | C_INT                   -> fprintf ppf "INT"
diff --git a/src/stages/4-ast_typed/combinators.ml b/src/stages/4-ast_typed/combinators.ml
index 43613c100..54a6e6b22 100644
--- a/src/stages/4-ast_typed/combinators.ml
+++ b/src/stages/4-ast_typed/combinators.ml
@@ -54,13 +54,13 @@ let t_contract t ?loc ?s () : type_expression = make_t ?loc (T_operator (TC_cont
 
 let t_record m ?loc ?s () : type_expression = make_t ?loc (T_record m) s
 let make_t_ez_record ?loc (lst:(string * type_expression) list) : type_expression =
-  let lst = List.map (fun (x,y) -> (Label x, y) ) lst in
+  let lst = List.map (fun (x,y) -> (Label x, {field_type=y;michelson_annotation=None}) ) lst in
   let map = LMap.of_list lst in
   make_t ?loc (T_record map) None
 let ez_t_record lst ?loc ?s () : type_expression =
   let m = LMap.of_list lst in
   t_record m ?loc ?s ()
-let t_pair a b ?loc ?s ()   : type_expression = ez_t_record [(Label "0",a) ; (Label "1",b)] ?loc ?s ()
+let t_pair a b ?loc ?s ()   : type_expression = ez_t_record [(Label "0",{field_type=a;michelson_annotation=None}) ; (Label "1",{field_type=b;michelson_annotation=None})] ?loc ?s ()
 
 let t_map ?loc k v ?s () = make_t ?loc (T_operator (TC_map { k ; v })) s
 let t_big_map ?loc k v ?s () = make_t ?loc (T_operator (TC_big_map { k ; v })) s
@@ -150,7 +150,9 @@ let tuple_of_record (m: _ LMap.t) =
     let opt = LMap.find_opt (Label (string_of_int i)) m in
     Option.bind (fun opt -> Some (opt,i+1)) opt
   in
-  Base.Sequence.to_list @@ Base.Sequence.unfold ~init:0 ~f:aux
+  let l = Base.Sequence.to_list @@ Base.Sequence.unfold ~init:0 ~f:aux in
+  List.map (fun {field_type;_} -> field_type) l
+
 
 let get_t_tuple (t:type_expression) : type_expression list result = match t.type_content with
   | T_record lst -> ok @@ tuple_of_record lst
@@ -178,13 +180,14 @@ let get_t_function_full (t:type_expression) : (type_expression * type_expression
     | _ -> ([],t)
   in
   let (input,output) = aux 0 t in
+  let input = List.map (fun (l,t) -> (l,{field_type = t ; michelson_annotation = None})) input in
   ok @@ (t_record (LMap.of_list input) (),output) 
 
 let get_t_sum (t:type_expression) : ctor_content constructor_map result = match t.type_content with
   | T_sum m -> ok m
   | _ -> fail @@ Errors.not_a_x_type "sum" t ()
 
-let get_t_record (t:type_expression) : type_expression label_map result = match t.type_content with
+let get_t_record (t:type_expression) : field_content label_map result = match t.type_content with
   | T_record m -> ok m
   | _ -> fail @@ Errors.not_a_x_type "record" t ()
 
@@ -306,14 +309,20 @@ let e_a_mutez n = make_e (e_mutez n) (t_mutez ())
 let e_a_bool b = make_e (e_bool b) (t_bool ())
 let e_a_string s = make_e (e_string s) (t_string ())
 let e_a_address s = make_e (e_address s) (t_address ())
-let e_a_pair a b = make_e (e_pair a b) (t_pair a.type_expression b.type_expression ())
+let e_a_pair a b = make_e (e_pair a b)
+  (t_pair a.type_expression b.type_expression () )
 let e_a_some s = make_e (e_some s) (t_option s.type_expression ())
 let e_a_lambda l in_ty out_ty = make_e (e_lambda l) (t_function in_ty out_ty ())
 let e_a_none t = make_e (e_none ()) (t_option t ())
-let e_a_record r = make_e (e_record r) (t_record (LMap.map get_type_expression r) ())
+let e_a_record r = make_e (e_record r) (t_record
+  (LMap.map
+    (fun t ->
+      let field_type = get_type_expression t in
+      {field_type ; michelson_annotation=None} )
+    r ) () )
 let e_a_application a b = make_e (e_application a b) (get_type_expression b)
 let e_a_variable v ty = make_e (e_variable v) ty
-let ez_e_a_record r = make_e (ez_e_record r) (ez_t_record (List.map (fun (x, y) -> x, y.type_expression) r) ())
+let ez_e_a_record r = make_e (ez_e_record r) (ez_t_record (List.map (fun (x, y) -> x, {field_type = y.type_expression ; michelson_annotation = None}) r) ())
 let e_a_let_in binder expr body attributes = make_e (e_let_in binder expr body attributes) (get_type_expression body)
 
 
diff --git a/src/stages/4-ast_typed/combinators.mli b/src/stages/4-ast_typed/combinators.mli
index 0b9315088..9c7523e9e 100644
--- a/src/stages/4-ast_typed/combinators.mli
+++ b/src/stages/4-ast_typed/combinators.mli
@@ -25,9 +25,9 @@ val t_option : type_expression -> ?loc:Location.t -> ?s:S.type_expression -> uni
 val t_pair : type_expression -> type_expression -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
 val t_list  : type_expression -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
 val t_variable : type_variable -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
-val t_record : type_expression label_map -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
+val t_record : te_lmap -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression
 val make_t_ez_record : ?loc:Location.t -> (string* type_expression) list -> type_expression 
-val ez_t_record : ( label * type_expression ) list -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression 
+val ez_t_record : ( label * field_content ) list -> ?loc:Location.t -> ?s:S.type_expression -> unit -> type_expression 
 
 val t_map : ?loc:Location.t -> type_expression -> type_expression -> ?s:S.type_expression -> unit -> type_expression
 val t_big_map : ?loc:Location.t -> type_expression -> type_expression -> ?s:S.type_expression -> unit -> type_expression
@@ -65,7 +65,7 @@ val get_t_pair : type_expression -> ( type_expression * type_expression ) result
 val get_t_function : type_expression -> ( type_expression * type_expression ) result
 val get_t_function_full : type_expression -> ( type_expression * type_expression ) result
 val get_t_sum : type_expression -> ctor_content constructor_map result
-val get_t_record : type_expression -> type_expression label_map result
+val get_t_record : type_expression -> field_content label_map result
 val get_t_map : type_expression -> ( type_expression * type_expression ) result
 val get_t_big_map : type_expression -> ( type_expression * type_expression ) result
 val get_t_map_key : type_expression -> type_expression result
diff --git a/src/stages/4-ast_typed/helpers.ml b/src/stages/4-ast_typed/helpers.ml
index 67f7cd108..4aa1a374b 100644
--- a/src/stages/4-ast_typed/helpers.ml
+++ b/src/stages/4-ast_typed/helpers.ml
@@ -120,6 +120,11 @@ let bind_fold_lmap f init (lmap:_ LMap.t) =
   LMap.fold aux lmap init
 
 let bind_map_lmap f map = bind_lmap (LMap.map f map)
+let bind_map_lmap_t f map = bind_lmap (
+  LMap.map 
+    (fun ({field_type;_}) -> 
+      f field_type)
+    map)
 let bind_map_cmap f map = bind_cmap (CMap.map f map)
 let bind_map_lmapi f map = bind_lmap (LMap.mapi f map)
 let bind_map_cmapi f map = bind_cmap (CMap.mapi f map)
@@ -137,7 +142,7 @@ let is_tuple_lmap m =
 let get_pair m =
   let open Trace in
   match (LMap.find_opt (Label "0") m , LMap.find_opt (Label "1") m) with
-  | Some e1, Some e2 -> ok (e1,e2)
+  | Some {field_type=e1;_}, Some {field_type=e2;_} -> ok (e1,e2)
   | _ -> simple_fail "not a pair"
 
 let tuple_of_record (m: _ LMap.t) =
@@ -164,4 +169,13 @@ let kv_list_of_record_or_tuple (m: _ LMap.t) =
 let is_michelson_or (t: _ constructor_map) =
   CMap.cardinal t = 2 && 
   (CMap.mem (Constructor "M_left") t) &&
-  (CMap.mem (Constructor "M_right") t)
\ No newline at end of file
+  (CMap.mem (Constructor "M_right") t)
+
+let is_michelson_pair (t: _ label_map) =
+  let l = LMap.to_list t in
+  List.fold_left
+    (fun prev {field_type=_;michelson_annotation} -> match michelson_annotation with
+      | Some _ -> true
+      | None -> prev)
+    false 
+    l
diff --git a/src/stages/4-ast_typed/misc.ml b/src/stages/4-ast_typed/misc.ml
index 423220a13..8612f2ece 100644
--- a/src/stages/4-ast_typed/misc.ml
+++ b/src/stages/4-ast_typed/misc.ml
@@ -377,7 +377,7 @@ let rec assert_type_expression_eq (a, b: (type_expression * type_expression)) :
       let sort_lmap r' = List.sort (fun (Label a,_) (Label b,_) -> String.compare a b) r' in
       let ra' = sort_lmap @@ LMap.to_kv_list ra in
       let rb' = sort_lmap @@ LMap.to_kv_list rb in
-      let aux ((ka, va), (kb, vb)) =
+      let aux ((ka, {field_type=va;_}), (kb, {field_type=vb;_})) =
         let%bind _ =
           trace (different_types "records" a b) @@
           let Label ka = ka in
diff --git a/src/stages/4-ast_typed/types.ml b/src/stages/4-ast_typed/types.ml
index 099469a21..a25734369 100644
--- a/src/stages/4-ast_typed/types.ml
+++ b/src/stages/4-ast_typed/types.ml
@@ -20,7 +20,7 @@ type type_constant =
     | TC_void
 
 type te_cmap = ctor_content constructor_map
-and te_lmap = type_expression label_map
+and te_lmap = field_content label_map
 and type_meta = ast_core_type_expression option
 
 and type_content =
@@ -43,6 +43,11 @@ and ctor_content = {
     michelson_annotation : annot_option;
 }
 
+and field_content = {
+    field_type : type_expression;
+    michelson_annotation : annot_option;
+}
+
 and type_map_args = {
     k : type_expression;
     v : type_expression;
diff --git a/src/stages/common/PP.ml b/src/stages/common/PP.ml
index 1de0b6e8c..2d784057d 100644
--- a/src/stages/common/PP.ml
+++ b/src/stages/common/PP.ml
@@ -8,29 +8,8 @@ let constructor ppf (c:constructor') : unit =
 let label ppf (l:label) : unit =
   let Label l = l in fprintf ppf "%s" l
 
-let record_sep value sep ppf (m : 'a label_map) =
-  let lst = LMap.to_kv_list m in
-  let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
-  let new_pp ppf (k, v) = fprintf ppf "@[<h>%a -> %a@]" label k value v in
-  fprintf ppf "%a" (list_sep new_pp sep) lst
-
-let tuple_sep value sep ppf m =
-  assert (Helpers.is_tuple_lmap m);
-  let lst = Helpers.tuple_of_record m in
-  let new_pp ppf (_, v) = fprintf ppf "%a" value v in
-  fprintf ppf "%a" (list_sep new_pp sep) lst
-
-(* Prints records which only contain the consecutive fields
-   0..(cardinal-1) as tuples *)
-let tuple_or_record_sep value format_record sep_record format_tuple sep_tuple ppf m =
-  if Helpers.is_tuple_lmap m then
-    fprintf ppf format_tuple (tuple_sep value (tag sep_tuple)) m
-  else
-    fprintf ppf format_record (record_sep value (tag sep_record)) m
 
 let list_sep_d x = list_sep x (tag " ,@ ")
-let tuple_or_record_sep_expr value = tuple_or_record_sep value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " ,@ "
-let tuple_or_record_sep_type value = tuple_or_record_sep value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " *@ "
 
 let constant ppf : constant' -> unit = function
   | C_INT                   -> fprintf ppf "INT"
@@ -200,6 +179,46 @@ module Ast_PP_type (PARAMETER : AST_PARAMETER_TYPE) = struct
     fprintf ppf "%a" (list_sep new_pp sep) lst
   let cmap_sep_d x = cmap_sep x (tag " ,@ ")
 
+  let record_sep value sep ppf (m : 'a label_map) =
+    let lst = LMap.to_kv_list m in
+    let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
+    let new_pp ppf (k, {field_type;_}) = fprintf ppf "@[<h>%a -> %a@]" label k value field_type in
+    fprintf ppf "%a" (list_sep new_pp sep) lst
+
+  let tuple_sep value sep ppf m =
+    assert (Helpers.is_tuple_lmap m);
+    let lst = Helpers.tuple_of_record m in
+    let new_pp ppf (_, {field_type;_}) = fprintf ppf "%a" value field_type in
+    fprintf ppf "%a" (list_sep new_pp sep) lst
+
+  let record_sep_expr value sep ppf (m : 'a label_map) =
+    let lst = LMap.to_kv_list m in
+    let lst = List.sort_uniq (fun (Label a,_) (Label b,_) -> String.compare a b) lst in
+    let new_pp ppf (k, v) = fprintf ppf "@[<h>%a -> %a@]" label k value v in
+    fprintf ppf "%a" (list_sep new_pp sep) lst
+
+  let tuple_sep_expr value sep ppf m =
+    assert (Helpers.is_tuple_lmap m);
+    let lst = Helpers.tuple_of_record m in
+    let new_pp ppf (_,v) = fprintf ppf "%a" value v in
+    fprintf ppf "%a" (list_sep new_pp sep) lst
+
+  (* Prints records which only contain the consecutive fields
+    0..(cardinal-1) as tuples *)
+  let tuple_or_record_sep_t value format_record sep_record format_tuple sep_tuple ppf m =
+    if Helpers.is_tuple_lmap m then
+      fprintf ppf format_tuple (tuple_sep value (tag sep_tuple)) m
+    else
+      fprintf ppf format_record (record_sep value (tag sep_record)) m
+
+  let tuple_or_record_sep_expr value format_record sep_record format_tuple sep_tuple ppf m =
+    if Helpers.is_tuple_lmap m then
+      fprintf ppf format_tuple (tuple_sep_expr value (tag sep_tuple)) m
+    else
+      fprintf ppf format_record (record_sep_expr value (tag sep_record)) m
+
+  let tuple_or_record_sep_expr value = tuple_or_record_sep_expr value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " ,@ "
+  let tuple_or_record_sep_type value = tuple_or_record_sep_t value "@[<hv 7>record[%a]@]" " ,@ " "@[<hv 2>( %a )@]" " *@ "
 
   let rec type_expression' :
          (formatter -> type_expression -> unit)
diff --git a/src/stages/common/types.ml b/src/stages/common/types.ml
index 5f3b9a84d..c2f7fba56 100644
--- a/src/stages/common/types.ml
+++ b/src/stages/common/types.ml
@@ -40,7 +40,7 @@ module Ast_generic_type (PARAMETER : AST_PARAMETER_TYPE) = struct
 
   type type_content =
     | T_sum of ctor_content constructor_map
-    | T_record of type_expression label_map
+    | T_record of field_content label_map
     | T_arrow of arrow
     | T_variable of type_variable
     | T_constant of type_constant
@@ -50,6 +50,8 @@ module Ast_generic_type (PARAMETER : AST_PARAMETER_TYPE) = struct
   
   and ctor_content = {ctor_type : type_expression ; michelson_annotation : string option}
 
+  and field_content = {field_type : type_expression ; field_annotation : string option}
+
   and type_operator =
     | TC_contract of type_expression
     | TC_option of type_expression
diff --git a/src/test/contracts/michelson_pair_tree.ligo b/src/test/contracts/michelson_pair_tree.ligo
new file mode 100644
index 000000000..10a659251
--- /dev/null
+++ b/src/test/contracts/michelson_pair_tree.ligo
@@ -0,0 +1,8 @@
+type inner_storage is michelson_pair(int,"one",nat,"two")
+type storage is michelson_pair (string,"three",inner_storage,"four")
+
+type return is list(operation) * storage
+
+function main (const action : unit; const store : storage) : return is block {
+  const foo : storage = ("foo",(1,2n)) ;
+} with ((nil : list(operation)), (foo: storage))