diff --git a/src/bin/expect_tests/contract_tests.ml b/src/bin/expect_tests/contract_tests.ml
index 7025aa1a2..d069c62aa 100644
--- a/src/bin/expect_tests/contract_tests.ml
+++ b/src/bin/expect_tests/contract_tests.ml
@@ -18,6 +18,9 @@ let%expect_test _ =
   run_ligo_good [ "measure-contract" ; contract "vote.mligo" ; "main" ] ;
   [%expect {| 582 bytes |}] ;
 
+  run_ligo_good [ "measure-contract" ; contract "issue-184-combs.mligo" ; "main2" ] ;
+  [%expect {| 369 bytes |}] ;
+
   run_ligo_good [ "compile-parameter" ; contract "coase.ligo" ; "main" ; "Buy_single (record card_to_buy = 1n end)" ] ;
   [%expect {| (Left (Left 1)) |}] ;
 
diff --git a/src/passes/9-self_ast_typed/dune b/src/passes/9-self_ast_typed/dune
index 0fc22a1d3..3f00581ac 100644
--- a/src/passes/9-self_ast_typed/dune
+++ b/src/passes/9-self_ast_typed/dune
@@ -4,6 +4,7 @@
   (libraries
     simple-utils
     ast_typed
+    environment
   )
   (preprocess
     (pps ppx_let bisect_ppx --conditional)
diff --git a/src/passes/9-self_ast_typed/recompute_environment.ml b/src/passes/9-self_ast_typed/recompute_environment.ml
new file mode 100644
index 000000000..4124038c2
--- /dev/null
+++ b/src/passes/9-self_ast_typed/recompute_environment.ml
@@ -0,0 +1,162 @@
+open Ast_typed
+
+(*
+  During the modifications of the passes on `Ast_typed`, the binding
+  environments are not kept in sync. To palliate this, this module
+  recomputes them from scratch.
+*)
+
+(*
+  This module is very coupled to `typer.ml`. Given environments are
+  not used until the next pass, it makes sense to split this into
+  its own separate pass. This pass would go from `Ast_typed` without
+  environments to `Ast_typed` with embedded environments.
+*)
+
+let rec expression : environment -> expression -> expression = fun env expr ->
+  (* Standard helper functions to help with the fold *)
+  let return ?(env' = env) content = {
+      expr with
+      environment = env' ;
+      expression_content = content ;
+    } in
+  let return_id = return expr.expression_content in
+  let self ?(env' = env) x = expression env' x in
+  let self_list lst = List.map self lst in
+  let self_2 a b = self a , self b in
+  let self_lmap lm = LMap.map self lm in
+  let self_cases cs = cases env cs in
+  match expr.expression_content with
+  | E_lambda c -> (
+    let (t_binder , _) = Combinators.get_t_function_exn expr.type_expression in
+    let env' = Environment.add_ez_binder c.binder t_binder env in
+    let result = self ~env' c.result in
+    return @@ E_lambda { c with result }
+  )
+  | E_let_in c -> (
+    let env' = Environment.add_ez_declaration c.let_binder c.rhs env in
+    let let_result = self ~env' c.let_result in
+    let rhs = self c.rhs in
+    return @@ E_let_in { c with rhs ; let_result }
+  )
+  (* rec fun_name binder -> result *)
+  | E_recursive c -> (
+    let env_fun_name = Environment.add_ez_binder c.fun_name c.fun_type env in
+    let (t_binder , _) = Combinators.get_t_function_exn c.fun_type in
+    let env_binder = Environment.add_ez_binder c.lambda.binder t_binder env_fun_name in
+    let result = self ~env':env_binder c.lambda.result in
+    let lambda = { c.lambda with result } in
+    return @@ E_recursive { c with lambda }
+  )
+  (* All the following cases are administrative *)
+  | E_literal _ -> return_id
+  | E_variable _ -> return_id
+  | E_constant c -> (
+    let arguments = self_list c.arguments in
+    return @@ E_constant { c with arguments }
+  )
+  | E_application c -> (
+    let (lamb , args) = self_2 c.lamb c.args in
+    return @@ E_application { lamb ; args }
+  )
+  | E_constructor c -> (
+    let element = self c.element in
+    return @@ E_constructor { c with element }
+  )
+  | E_record c -> (
+    let c' = self_lmap c in
+    return @@ E_record c'
+  )
+  | E_record_accessor c -> (
+    let record = self c.record in
+    return @@ E_record_accessor { c with record }
+  )
+  | E_record_update c -> (
+    let (record , update) = self_2 c.record c.update in
+    return @@ E_record_update { c with record ; update }
+  )
+  | E_matching c -> (
+    let matchee = self c.matchee in
+    let cases = self_cases c.cases in
+    return @@ E_matching { matchee ; cases }
+  )
+
+and cases : environment -> matching_expr -> matching_expr = fun env cs ->
+  let return x = x in
+  let self ?(env' = env) x = expression env' x in
+  match cs with
+  | Match_list c -> (
+    let match_nil = self c.match_nil in
+    let match_cons =
+      let mc = c.match_cons in
+      let env_hd = Environment.add_ez_binder mc.hd mc.tv env in
+      let env_tl = Environment.add_ez_binder mc.tl (t_list mc.tv ()) env_hd in
+      let body = self ~env':env_tl mc.body in
+      { mc with body }
+    in
+    return @@ Match_list { match_nil ; match_cons }
+  )
+  | Match_option c -> (
+    let match_none = self c.match_none in
+    let match_some =
+      let ms = c.match_some in
+      let env' = Environment.add_ez_binder ms.opt ms.tv env in
+      let body = self ~env' ms.body in
+      { ms with body }
+    in
+    return @@ Match_option { match_none ; match_some }
+  )
+  | Match_tuple c -> (
+    let var_tvs =
+      try (
+        List.combine c.vars c.tvs
+      ) with _ -> raise (Failure ("Internal error: broken invariant at " ^ __LOC__))
+    in
+    let env' =
+      let aux prev (var , tv) =
+        Environment.add_ez_binder var tv prev
+      in
+      List.fold_left aux env var_tvs
+    in
+    let body = self ~env' c.body in
+    return @@ Match_tuple { c with body }
+  )
+  | Match_variant c -> (
+    let variant_type = Combinators.get_t_sum_exn c.tv in
+    let cases =
+      let aux (c : matching_content_case) =
+        let case =
+          try (
+            CMap.find c.constructor variant_type
+          ) with _ -> raise (Failure ("Internal error: broken invariant at " ^ __LOC__))
+        in
+        let env' = Environment.add_ez_binder c.pattern case.ctor_type env in
+        let body = self ~env' c.body in
+        { c with body }
+      in
+      List.map aux c.cases
+    in
+    return @@ Match_variant { c with cases }
+  )
+
+let program : environment -> program -> program = fun init_env prog ->
+  (*
+      BAD
+      We take the old type environment and add it to the current value environment
+      because type declarations are removed in the typer. They should be added back.
+   *)
+  let merge old_env re_env = {
+      expression_environment = re_env.expression_environment ;
+      type_environment = old_env.type_environment ;
+    } in
+  let aux (pre_env , rev_decls) decl_wrapped =
+    let (Declaration_constant c) = Location.unwrap decl_wrapped in
+    let expr = expression pre_env c.expr in
+    let post_env = Environment.add_ez_declaration c.binder c.expr pre_env in
+    let post_env' = merge c.post_env post_env in
+    let wrap_content = Declaration_constant { c with expr ; post_env = post_env' } in
+    let decl_wrapped' = { decl_wrapped with wrap_content } in
+    (post_env , decl_wrapped' :: rev_decls)
+  in
+  let (_last_env , rev_decls) = List.fold_left aux (init_env , []) prog in
+  List.rev rev_decls
diff --git a/src/passes/9-self_ast_typed/self_ast_typed.ml b/src/passes/9-self_ast_typed/self_ast_typed.ml
index fc9d27a5c..77b50ce9c 100644
--- a/src/passes/9-self_ast_typed/self_ast_typed.ml
+++ b/src/passes/9-self_ast_typed/self_ast_typed.ml
@@ -10,9 +10,11 @@ let contract_passes = [
   No_nested_big_map.self_typing ;
 ]
 
-let all_program =
+let all_program program =
   let all_p = List.map Helpers.map_program all_passes in
-  bind_chain all_p
+  let%bind program' = bind_chain all_p program in
+  let program'' = Recompute_environment.program Environment.default program' in
+  ok program''
 
 let all_expression =
   let all_p = List.map Helpers.map_expression all_passes in
diff --git a/src/stages/4-ast_typed/combinators.ml b/src/stages/4-ast_typed/combinators.ml
index eca86d173..e7959cec7 100644
--- a/src/stages/4-ast_typed/combinators.ml
+++ b/src/stages/4-ast_typed/combinators.ml
@@ -174,9 +174,17 @@ let get_t_pair (t:type_expression) : (type_expression * type_expression) result
       ok List.(nth lst 0 , nth lst 1)
   | _ -> fail @@ Errors.not_a_x_type "pair (tuple with two elements)" t ()
 
-let get_t_function (t:type_expression) : (type_expression * type_expression) result = match t.type_content with
-  | T_arrow {type1;type2} -> ok (type1,type2)
-  | _ -> simple_fail "not a function"
+let get_t_function_opt (t:type_expression) : (type_expression * type_expression) option = match t.type_content with
+  | T_arrow {type1;type2} -> Some (type1,type2)
+  | _ -> None
+
+let get_t_function t =
+  trace_option (Errors.not_a_x_type "function" t ()) @@
+    get_t_function_opt t
+
+let get_t_function_exn t = match get_t_function_opt t with
+  | Some x -> x
+  | None -> raise (Failure ("Internal error: broken invariant at " ^ __LOC__))
 
 let get_t_function_full (t:type_expression) : (type_expression * type_expression) result =
   let%bind _ = get_t_function t in
@@ -190,9 +198,17 @@ let get_t_function_full (t:type_expression) : (type_expression * type_expression
   let input = List.map (fun (l,t) -> (l,{field_type = t ; michelson_annotation = None ; field_decl_pos = 0})) 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_sum_opt (t:type_expression) : ctor_content constructor_map option = match t.type_content with
+  | T_sum m -> Some m
+  | _ -> None
+
+let get_t_sum t = match get_t_sum_opt t with
+  | Some m -> ok m
+  | None -> fail @@ Errors.not_a_x_type "sum" t ()
+
+let get_t_sum_exn t = match get_t_sum_opt t with
+  | Some m -> m
+  | None -> raise (Failure ("Internal error: broken invariant at " ^ __LOC__))
 
 let get_t_record (t:type_expression) : field_content label_map result = match t.type_content with
   | T_record m -> ok m
diff --git a/src/stages/4-ast_typed/combinators.mli b/src/stages/4-ast_typed/combinators.mli
index e3ce6a156..7568455d5 100644
--- a/src/stages/4-ast_typed/combinators.mli
+++ b/src/stages/4-ast_typed/combinators.mli
@@ -63,8 +63,12 @@ val get_t_key_hash : type_expression -> unit result
 val get_t_tuple : type_expression -> type_expression list result
 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_opt : type_expression -> ( type_expression * type_expression ) option
+val get_t_function_exn : type_expression -> ( type_expression * type_expression )
 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_sum_opt : type_expression -> ctor_content constructor_map option
+val get_t_sum_exn : type_expression -> ctor_content constructor_map
 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
diff --git a/src/stages/5-mini_c/environment.mli b/src/stages/5-mini_c/environment.mli
index 231925b97..51191df32 100644
--- a/src/stages/5-mini_c/environment.mli
+++ b/src/stages/5-mini_c/environment.mli
@@ -19,7 +19,7 @@ module Environment : sig
   val to_list : t -> element list
   val get_names : t -> expression_variable list
   val remove : int -> t -> t
-  val select : ?rev:bool -> ?keep:bool -> expression_variable list -> t -> t
+  (* val select : ?rev:bool -> ?keep:bool -> expression_variable list -> t -> t *)
   (*
   val fold : ('a -> element -> 'a ) -> 'a -> t -> 'a
   val filter : ( element -> bool ) -> t -> t
diff --git a/src/test/contracts/issue-184-combs.mligo b/src/test/contracts/issue-184-combs.mligo
new file mode 100644
index 000000000..7c1ab6dd8
--- /dev/null
+++ b/src/test/contracts/issue-184-combs.mligo
@@ -0,0 +1,34 @@
+(* Test case from https://gitlab.com/ligolang/ligo/-/issues/184 *)
+
+type foo = {
+  bar : string;
+  baz : nat;
+}
+
+type foo_michelson = foo michelson_pair_right_comb
+
+type union1 =
+| Choice1 of foo
+| Choice2 of foo
+
+type union1_aux =
+| Option1 of foo_michelson
+| Option2 of foo_michelson
+
+type union1_michelson = union1_aux michelson_or_right_comb
+
+let union1_from_michelson (m : union1_michelson) : union1 =
+ let aux : union1_aux = Layout.convert_from_right_comb m in
+ match aux with
+ | Option1 fm ->
+  let f : foo = Layout.convert_from_right_comb fm in
+  Choice1 f
+| Option2 fm ->
+  let f : foo = Layout.convert_from_right_comb fm in
+  Choice2 f
+
+let main2 (ums, us : (union1_michelson list) * (union1 list)) =
+  let new_us = List.map union1_from_michelson ums in
+  ([] : operation list), new_us
+
+