Replace record type with tuple for Match

nftables.ml

@@ -35,12 +35,7 @@ type verdict =
   | Goto of string
 
 type _ stmt =
-  | Match : {
-      left : 'a expr;
-      right : 'b expr;
-      op : ('a, 'b) match_op;
-    }
-      -> unit stmt
+  | Match : (('a, 'b) match_op * 'a expr * 'b expr) -> unit stmt
   | Counter : counter -> unit stmt
   | Verdict : verdict -> unit stmt
   | NoTrack : unit stmt
@@ -136,7 +131,7 @@ let json_of_verdict = function
   | Goto s -> assoc_one "goto" (assoc_one "target" (`String s))
 
 let json_of_stmt : type a. a stmt -> Yojson.Basic.t = function
-  | Match { left; right; op } ->
+  | Match (op, left, right) ->
       assoc_one "match"
         (`Assoc
           [