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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] acct-user/root-0-r3::gentoo  0 KiB
[ebuild   R    ] acct-user/mail-0-r3::gentoo  0 KiB

Total: 2 packages (1 new, 1 reinstall), Size of downloads: 0 KiB