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

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

[ebuild   R    ] virtual/libudev-251-r2:0/1::gentoo  USE="(-systemd)" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB