Only look at arg.type_value instead of arg.content

src/passes/6-transpiler/transpiler.ml

@@ -283,18 +283,21 @@ and transpile_annotated_expression (ae:AST.annotated_expression) : expression re
   | E_application (a, b) ->
       let%bind a = transpile_annotated_expression a in
       let%bind b = transpile_annotated_expression b in
-      let%bind _err = Self_mini_c.Helpers.fold_expression
-        (fun sub_arg exp ->
-          match (exp.type_value , exp.content) with
-          | T_pair _ , _ -> ok false
-          | T_base _ , E_application _ -> ok true
-          | (T_deep_closure _), _ ->
-            let errmsg = Format.asprintf "Cannot apply closure in function arguments: %a\n"
-              Mini_c.PP.expression_with_type b in
-            if sub_arg then ok sub_arg else fail @@ simple_error errmsg
-          | _,_ -> ok sub_arg
-        ) false b in
-      return @@ E_application (a, b)
+      let%bind contains_closure =
+        Self_mini_c.Helpers.fold_type_value
+          (fun contains_closure exp ->
+            ok (contains_closure
+                || match exp with
+                   | T_deep_closure _ -> true
+                   | _ -> false))
+          false
+          b.type_value in
+      if contains_closure
+      then
+        let errmsg = Format.asprintf "Cannot apply closure in function arguments: %a\n"
+                       Mini_c.PP.expression_with_type b in
+        fail @@ simple_error errmsg
+      else return @@ E_application (a, b)
   | E_constructor (m, param) -> (
       let%bind param' = transpile_annotated_expression param in
       let (param'_expr , param'_tv) = Combinators.Expression.(get_content param' , get_type param') in

src/passes/7-self_mini_c/helpers.ml

@@ -1,6 +1,26 @@
 open Mini_c
 open Trace
 
+let rec fold_type_value : ('a -> type_value -> 'a result) -> 'a -> type_value -> 'a result = fun f init t ->
+  let self = fold_type_value f in
+  let%bind init' = f init t in
+  match t with
+  | T_pair ((_, a), (_, b))
+  | T_or ((_, a), (_, b))
+  | T_function (a, b)
+  | T_map (a, b)
+  | T_big_map (a, b) ->
+     bind_fold_pair self init' (a, b)
+  | T_deep_closure (env, a, b) ->
+     bind_fold_list self init' (List.map snd env @ [a; b])
+  | T_list a
+  | T_set a
+  | T_contract a
+  | T_option a ->
+     self init' a
+  | T_base _ ->
+     ok init'
+
 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