From 7f9ea7ad9fa9c4a1a9515df2732b0dcdea145f63 Mon Sep 17 00:00:00 2001
From: catvayor <catvayor@katvayor.net>
Date: Wed, 22 Jan 2025 17:43:54 +0100
Subject: [PATCH] feat(ocamlPackages): init ocamlPackagesExtensions

---
 pkgs/top-level/all-packages.nix   |  1 +
 pkgs/top-level/ocaml-packages.nix | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 86c329e9a1b4..130b6425aa42 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6638,6 +6638,7 @@ with pkgs;
   ocaml-ng = callPackage ./ocaml-packages.nix { };
   ocaml = ocamlPackages.ocaml;
 
+  ocamlPackagesExtensions = [ ];
   ocamlPackages = recurseIntoAttrs ocaml-ng.ocamlPackages;
 
   ocaml-crunch = ocamlPackages.crunch.bin;
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 84d0d4032c01..ed7a64f61b5e 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1,10 +1,10 @@
-{ lib, newScope, pkgs, config }:
+{ lib, newScope, pkgs, ocamlPackagesExtensions, config }:
 
 let
   liftJaneStreet = self: super: super.janeStreet // super;
 
-  mkOcamlPackages = ocaml:
-    (lib.makeScope newScope (self: with self;
+  base-packages = ocaml:
+    self: with self;
   {
     inherit ocaml;
 
@@ -2053,7 +2053,12 @@ let
 
     ### End ###
 
-  })).overrideScope liftJaneStreet;
+  };
+
+  mkOcamlPackages = ocaml:
+    (lib.makeScope newScope (
+      lib.extends (lib.composeManyExtensions ocamlPackagesExtensions) (base-packages ocaml)
+    )).overrideScope liftJaneStreet;
 
 in let inherit (pkgs) callPackage; in rec
 {
-- 
2.47.0