Revert "ocaml-modules: fix naming: "_" -> "-""

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

@@ -0,0 +1,30 @@
+{stdenv, buildOcaml, fetchurl, type_conv,
+ bin_prot, comparelib, custom_printf, enumerate,
+ fieldslib, herelib, pa_bench, pa_test, pa_ounit,
+ pipebang, sexplib, typerep, variantslib}:
+
+buildOcaml rec {
+  name = "core_kernel";
+  version = "112.24.00";
+
+  minimumSupportedOcamlVersion = "4.02";
+
+  src = fetchurl {
+    url = "https://github.com/janestreet/core_kernel/archive/${version}.tar.gz";
+    sha256 = "93e1f21e35ade98a2bfbe45ba76eef4a8ad3fed97cdc0769f96e0fcc86d6a761";
+  };
+
+  hasSharedObjects = true;
+
+  buildInputs = [ pa_test pa_ounit ];
+  propagatedBuildInputs = [ type_conv pa_bench bin_prot comparelib custom_printf
+                            enumerate fieldslib herelib pipebang sexplib
+                            typerep variantslib ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/core_kernel;
+    description = "Jane Street Capital's standard library overlay (kernel)";
+    license = licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+  };
+}