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

Calculating dependencies ... done!
Dependency resolution took 1.51 s (backtrack: 0/20).

[ebuild     U  ] sys-libs/readline-8.3_p6:0/8::gentoo [8.3_p3:0/8::gentoo] USE="(unicode) -static-libs -utils -verify-sig" 3352 KiB

Total: 1 package (1 upgrade), Size of downloads: 3352 KiB