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

Calculating dependencies ... done!
Dependency resolution took 1.09 s (backtrack: 0/20).

[ebuild  N     ] acct-group/epmd-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/epmd-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-lang/erlang-29.0:0/29.0::gentoo  USE="kpoll ssl -doc -java -odbc -sctp (-systemd) -tk -wxwidgets" 65437 KiB
[ebuild  N     ] dev-util/rebar-2.6.4-r1::gentoo  209 KiB
[ebuild  N     ] dev-util/rebar-3.27.0:3::gentoo  USE="-test" 810 KiB
[ebuild  N     ] dev-erlang/jiffy-1.1.5::gentoo  1636 KiB
[ebuild  N     ] dev-erlang/idna-7.1.0::gentoo  836 KiB
[ebuild  N     ] dev-erlang/jose-1.11.12::gentoo  304 KiB
[ebuild  N     ] dev-erlang/base64url-1.0.1-r1::gentoo  3 KiB
[ebuild  N     ] dev-erlang/p1_utils-1.0.29::gentoo  48 KiB
[ebuild  N     ] dev-erlang/fast_yaml-1.0.40::gentoo  60 KiB
[ebuild  N     ] dev-erlang/yconf-1.0.23::gentoo  220 KiB
[ebuild  N     ] dev-erlang/p1_acme-1.0.22::gentoo  219 KiB

Total: 13 packages (13 new), Size of downloads: 69777 KiB