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

Calculating dependencies ... done!
Dependency resolution took 0.98 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/result-1.5:0/1.5::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/trie-1.0.0:0/1.0.0::gentoo  USE="ocamlopt" 3 KiB
[ebuild  N     ] dev-ml/mew-0.1.0-r1:0/0.1.0::gentoo  USE="ocamlopt -test" 5 KiB

Total: 5 packages (5 new), Size of downloads: 10089 KiB