1 files changed, 11 insertions, 15 deletions

diff --git a/lib/ledger.ml b/lib/ledger.ml
index ba21e49..84a0146 100644
--- a/lib/ledger.ml
+++ b/lib/ledger.ml
@@ -1,4 +1,4 @@
-open Core
+open Prelude
 
 type account_type = Asset | Equity | Liability | Expense | Income
 
@@ -87,12 +87,6 @@ module Labels = struct
                Sexp.List [ Sexp.Atom "Unit_label"; [%sexp_of: unit_tag] tag ]))
 end
 
-module Z = struct
-  include Z
-
-  let sexp_of_t x = Sexp.Atom (Z.to_string x)
-end
-
 module Money : sig
   type t
 
@@ -142,7 +136,15 @@ type bal_assert = {
 module Account_id_map = Map.Make (Account_id)
 
 module Tx : sig
-  type t
+  (* Private because we only want to allow constructing balanced transactions. *)
+  type t = private {
+    cleared : Date.t option;
+    commodity_id : commodity_id;
+    debit : scalar Account_id_map.t;
+    credit : scalar Account_id_map.t;
+    labels : Labels.t;
+  }
+
   type error = Unbalanced
 
   val make :
@@ -153,14 +155,8 @@ module Tx : sig
     labels:Labels.t ->
     (t, error) result
 
-  val cleared : t -> Date.t option
-  val commodity_id : t -> commodity_id
-  val debit : t -> scalar Account_id_map.t
-  val credit : t -> scalar Account_id_map.t
-  val labels : t -> Labels.t
   val sexp_of_t : t -> Sexp.t
 end = struct
-  (* We hide this because we only want to allow constructing balanced transactions *)
   type t = {
     cleared : Date.t option;
     commodity_id : commodity_id;
@@ -168,7 +164,7 @@ end = struct
     credit : scalar Account_id_map.t;
     labels : Labels.t;
   }
-  [@@deriving fields, sexp_of]
+  [@@deriving sexp_of]
 
   type error = Unbalanced