[cs] minor

gencommon.ml

@@ -4364,7 +4364,7 @@ struct
       | TMono _, _
       | TDynamic _, _
       | TAnon _, _ when gen.gneeds_box real_from_t -> 
-        mk_cast to_t (mk_paren e)
+        mk_cast to_t e
       | TMono _, _
       | TDynamic _, _ -> e
       | _, TMono _

gencs.ml

@@ -1248,7 +1248,7 @@ let configure gen =
       trace (debug_expr e);
       {
         eexpr = TCall({
-            eexpr = TField(e, "toDynamic");
+            eexpr = TField(mk_paren e, "toDynamic");
             etype = TFun([], t_dynamic);
             epos = e.epos
           }, []);