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

Calculating dependencies ... done!
Dependency resolution took 1.08 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/p1_utils-1.0.29::gentoo  48 KiB
[ebuild  N     ] dev-erlang/stringprep-1.0.34::gentoo  98 KiB
[ebuild  N     ] dev-erlang/p1_pgsql-1.1.41::gentoo  28 KiB

Total: 8 packages (8 new), Size of downloads: 66627 KiB