ocamlPackages: exit useDune2 (#468024)

doc/languages-frameworks/ocaml.section.md

@@ -45,10 +45,7 @@ Here is a simple package example.
 
 - It also accepts a `duneVersion` parameter (valid values are `"2"`, and
   `"3"`). The recommended practice is to set it only if you don't want the
-  default value and/or it depends on something else like package version. You
-  might see a not-supported argument `useDune2`. The behavior was `useDune2 =
-  true;` => `duneVersion = "2";` and `useDune2 = false;` => `duneVersion =
-  "1";`. It was used at the time when dune3 didn't exist.
+  default value and/or it depends on something else like package version.
 
 - It sets the optional `doCheck` attribute such that tests will be run with
   `dune runtest -p angstrom` after the build (`dune build -p angstrom`) is

pkgs/development/ocaml-modules/ocaml-syntax-shims/default.nix

@@ -4,26 +4,22 @@
   fetchurl,
 }:
 
-buildDunePackage rec {
-  minimumOCamlVersion = "4.02.3";
-
+buildDunePackage (finalAttrs: {
   pname = "ocaml-syntax-shims";
   version = "1.0.0";
 
   src = fetchurl {
-    url = "https://github.com/ocaml-ppx/${pname}/releases/download/${version}/${pname}-${version}.tbz";
-    sha256 = "1j7848khli4p7j8i2kmnvhdnhcwhy3zgdpf5ds5ic30ax69y3cl9";
+    url = "https://github.com/ocaml-ppx/ocaml-syntax-shims/releases/download/${finalAttrs.version}/ocaml-syntax-shims-${finalAttrs.version}.tbz";
+    hash = "sha256-ibLhk+kKDBaLbsXd9v7wkDNoG9y2ThGRPJdECici6Mg=";
   };
 
-  useDune2 = true;
-
   doCheck = true;
 
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/ocaml-ppx/ocaml-syntax-shims";
     description = "Backport new syntax to older OCaml versions";
     mainProgram = "ocaml-syntax-shims";
-    license = licenses.mit;
-    maintainers = with maintainers; [ sternenseemann ];
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ sternenseemann ];
   };
-}
+})