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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild   R    ] sys-apps/baselayout-2.18-r1::gentoo  USE="(split-usr) -build" 30 KiB

Total: 1 package (1 reinstall), Size of downloads: 30 KiB