These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-lang/ocaml-5.5.1:0/5.5.1::gentoo  USE="ocamlopt -emacs -flambda -latex -test -xemacs" 6457 KiB
[ebuild  N     ] dev-ml/dune-3.23.1:0/3.23.1::gentoo  USE="-emacs -test" 3624 KiB
[ebuild  N     ] dev-ml/findlib-1.9.8-r1:0/1::gentoo  USE="ocamlopt -doc -tk" 269 KiB
[ebuild  N     ] dev-ml/ocamlbuild-0.16.1:0/0.16.1::gentoo  USE="ocamlopt" 198 KiB
[ebuild  N     ] dev-ml/yojson-3.0.0:0/3.0.0::gentoo  USE="ocamlopt -examples -test" 56 KiB
[ebuild  N     ] dev-ml/ppx_derivers-1.2.1:0/1.2.1::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/result-1.5:0/1.5::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/ocaml-compiler-libs-0.17.0:0/0.17.0::gentoo  USE="ocamlopt" 5 KiB
[ebuild  N     ] dev-ml/sexplib0-0.17.0-r2:0/0.17::gentoo  USE="ocamlopt" 23 KiB
[ebuild  N     ] dev-ml/cppo-1.8.0:0/1.8.0::gentoo  USE="ocamlopt" 43 KiB
[ebuild  N     ] dev-ml/topkg-1.1.1:0/1.1.1::gentoo  USE="ocamlopt" 119 KiB
[ebuild  N     ] dev-ml/cmdliner-2.1.0:0/2.1.0::gentoo  USE="ocamlopt" 96 KiB
[ebuild  N     ] dev-ml/ppxlib-0.39.0:0/0.39.0::gentoo  USE="ocamlopt -test" 687 KiB
[ebuild  N     ] dev-ml/ppx_deriving-6.1.1:0/6.1.1::gentoo  USE="ocamlopt -test" 48 KiB
[ebuild  N     ] dev-ml/ppx_deriving_yojson-3.9.0:0/3.9.0::gentoo  USE="ocamlopt -test" 21 KiB

Total: 15 packages (15 new), Size of downloads: 11646 KiB