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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     U  ] app-eselect/eselect-lua-4-r3::gentoo [4-r1::gentoo] 0 KiB

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