Use more specific argument names

Co-authored-by: Nathan Rebours <[email protected]>

Author: patricoferris

test/expect/expect_test.ml

@@ -163,9 +163,9 @@ let main () =
     | Oval_string (s, maxlen, kind) ->
         Oval_string (s, (if maxlen < 8 then 8 else maxlen), kind)
     (*IF_NOT_AT_LEAST 504 | Oval_tuple tl -> Oval_tuple (List.map ~f:map_tree tl) *)
-    (*IF_AT_LEAST 504 | Oval_tuple tl -> Oval_tuple (List.map ~f:(fun (l, v) -> (l, map_tree v)) tl) *)
+    (*IF_AT_LEAST 504 | Oval_tuple tl -> Oval_tuple (List.map ~f:(fun (label, v) -> (label, map_tree v)) tl) *)
     (*IF_NOT_AT_LEAST 504 | Oval_array tl -> Oval_array (List.map ~f:map_tree tl) *)
-    (*IF_AT_LEAST 504 | Oval_array (tl, v) -> Oval_array ((List.map ~f:map_tree tl), v) *)
+    (*IF_AT_LEAST 504 | Oval_array (tl, mutable_) -> Oval_array ((List.map ~f:map_tree tl), mutable_) *)
     | Oval_list tl -> Oval_list (List.map ~f:map_tree tl)
     | Oval_record fel ->
         Oval_record