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

Calculating dependencies ... done!
Dependency resolution took 0.99 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/re-1.14.0:0/1.14.0::gentoo  USE="ocamlopt -test" 109 KiB
[ebuild  N     ] dev-ml/cinaps-0.15.1-r2:0/0.15.1::gentoo  USE="ocamlopt -test" 10 KiB

Total: 4 packages (4 new), Size of downloads: 10198 KiB