ocamlPackages.angstrom: use Dune 2

pkgs/development/ocaml-modules/angstrom-async/default.nix

@@ -3,7 +3,7 @@
 buildDunePackage rec {
   pname = "angstrom-async";
 
-  inherit (angstrom) version src;
+  inherit (angstrom) version useDune2 src;
 
   minimumOCamlVersion = "4.04.1";
 

pkgs/development/ocaml-modules/angstrom-lwt-unix/default.nix

@@ -3,7 +3,7 @@
 buildDunePackage rec {
   pname = "angstrom-lwt-unix";
 
-  inherit (angstrom) version src;
+  inherit (angstrom) version useDune2 src;
 
   minimumOCamlVersion = "4.03";
 

pkgs/development/ocaml-modules/angstrom-unix/default.nix

@@ -3,7 +3,7 @@
 buildDunePackage rec {
   pname = "angstrom-unix";
 
-  inherit (angstrom) version src;
+  inherit (angstrom) version useDune2 src;
 
   minimumOCamlVersion = "4.03";
 

pkgs/development/ocaml-modules/angstrom/default.nix

@@ -1,8 +1,9 @@
-{ lib, fetchFromGitHub, buildDunePackage, ocaml, alcotest, result, bigstringaf, ppx_let }:
+{ lib, fetchFromGitHub, buildDunePackage, ocaml, ocaml-syntax-shims, alcotest, result, bigstringaf, ppx_let }:
 
 buildDunePackage rec {
   pname = "angstrom";
   version = "0.15.0";
+  useDune2 = true;
 
   minimumOCamlVersion = "4.04";
 
@@ -14,6 +15,7 @@ buildDunePackage rec {
   };
 
   checkInputs = [ alcotest ppx_let ];
+  buildInputs = [ ocaml-syntax-shims ];
   propagatedBuildInputs = [ bigstringaf result ];
   doCheck = lib.versionAtLeast ocaml.version "4.05";