Simplify?

src/passes/1-parser/pascaligo/Parser.mly

@@ -591,11 +591,7 @@ assignment:
     in {region; value}}
 
 rhs:
-  expr {
+  expr  { Expr $1 }
-    match $1 with
-      EConstr (NoneExpr e) -> (NoneExpr e : rhs)
-    | e -> Expr e
-  }
 
 lhs:
   path       {    Path $1 }

src/passes/4-typer/typer.ml

@@ -616,7 +616,11 @@ and type_expression : environment -> ?tv_opt:O.type_value -> I.expression -> O.a
       return (E_lambda {binder = fst binder ; body}) (t_function input_type output_type ())
     )
   | E_constant ("NONE", []) ->
-    return (E_constant ("NONE", [])) (t_option_none ())
+    let%bind tv_opt = bind_map_option get_t_option tv_opt in
+    begin match tv_opt with
+    | None -> fail @@ simple_info "None without a type annotation"
+    | Some tv -> return (E_constant ("NONE", [])) (t_option tv ())
+    end
   | E_constant (name, lst) ->
       let%bind lst' = bind_list @@ List.map (type_expression e) lst in
       let tv_lst = List.map get_type_annotation lst' in
@@ -728,7 +732,7 @@ and type_expression : environment -> ?tv_opt:O.type_value -> I.expression -> O.a
           fail @@ not_supported_yet "assign expressions with maps are not supported yet" ae
       in
       bind_fold_list aux (typed_name.type_value , []) path in
-    let%bind expr' = type_expression e expr in
+    let%bind expr' = type_expression e ~tv_opt:assign_tv expr in
     let t_expr' = get_type_annotation expr' in
     let%bind () =
       trace_strong (type_error

src/passes/6-transpiler/transpiler.ml

@@ -130,8 +130,6 @@ let rec transpile_type (t:AST.type_value) : type_value result =
   | T_constant ("option", [o]) ->
       let%bind o' = transpile_type o in
       ok (T_option o')
-  | T_constant ("option_none", []) ->
-      ok (T_option (T_base Base_unit))
   | T_constant (name , _lst) -> fail @@ unrecognized_type_constant name
   (* TODO hmm *)
   | T_sum m ->

src/passes/6-transpiler/untranspiler.ml

@@ -107,14 +107,12 @@ let rec untranspile (v : value) (t : AST.type_value) : AST.annotated_expression
         get_string v in
       return (E_literal (Literal_address n))
     )
-  | T_constant ("option_none", []) ->
-    ok e_a_empty_none
   | T_constant ("option", [o]) -> (
       let%bind opt =
         trace_strong (wrong_mini_c_value "option" v) @@
         get_option v in
       match opt with
-      | None -> ok e_a_empty_none
+      | None -> ok (e_a_empty_none o)
       | Some s ->
           let%bind s' = untranspile s o in
           ok (e_a_empty_some s')

src/stages/ast_typed/combinators.ml

@@ -25,7 +25,6 @@ let t_tez ?s () : type_value = make_t (T_constant ("tez", [])) s
 let t_timestamp ?s () : type_value = make_t (T_constant ("timestamp", [])) s
 let t_unit ?s () : type_value = make_t (T_constant ("unit", [])) s
 let t_option o ?s () : type_value = make_t (T_constant ("option", [o])) s
-let t_option_none ?s () : type_value = make_t (T_constant ("option_none", [])) s
 let t_tuple lst ?s () : type_value = make_t (T_tuple lst) s
 let t_list t ?s () : type_value = make_t (T_constant ("list", [t])) s
 let t_set t ?s () : type_value = make_t (T_constant ("set", [t])) s
@@ -255,7 +254,7 @@ let e_a_address s = make_a_e (e_address s) (t_address ())
 let e_a_pair a b = make_a_e (e_pair a b) (t_pair a.type_annotation b.type_annotation ())
 let e_a_some s = make_a_e (e_some s) (t_option s.type_annotation ())
 let e_a_lambda l in_ty out_ty = make_a_e (e_lambda l) (t_function in_ty out_ty ())
-let e_a_none = make_a_e e_none (t_option_none ())
+let e_a_none t = make_a_e e_none (t_option t ())
 let e_a_tuple lst = make_a_e (E_tuple lst) (t_tuple (List.map get_type_annotation lst) ())
 let e_a_record r = make_a_e (e_record r) (t_record (SMap.map get_type_annotation r) ())
 let e_a_application a b = make_a_e (e_application a b) (get_type_annotation b)

src/stages/ast_typed/combinators_environment.ml

@@ -12,7 +12,7 @@ let e_a_empty_string s = e_a_string s Environment.full_empty
 let e_a_empty_address s = e_a_address s Environment.full_empty
 let e_a_empty_pair a b = e_a_pair a b Environment.full_empty
 let e_a_empty_some s = e_a_some s Environment.full_empty
-let e_a_empty_none = e_a_none Environment.full_empty
+let e_a_empty_none t = e_a_none t Environment.full_empty
 let e_a_empty_tuple lst = e_a_tuple lst Environment.full_empty
 let e_a_empty_record r = e_a_record r Environment.full_empty
 let e_a_empty_map lst k v = e_a_map lst k v Environment.full_empty

src/stages/ast_typed/misc.ml

@@ -296,9 +296,6 @@ let rec assert_type_value_eq (a, b: (type_value * type_value)) : unit result = m
       bind_list_iter assert_type_value_eq (List.combine ta tb)
     )
   | T_tuple _, _ -> fail @@ different_kinds a b
-  | T_constant ("option", _), T_constant ("option_none", []) |
-    T_constant ("option_none", []), T_constant ("option", _) -> 
-    ok ()
   | T_constant (ca, lsta), T_constant (cb, lstb) -> (
       let%bind _ =
         trace_strong (different_size_constants a b)