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

Calculating dependencies ... done!
Dependency resolution took 1.56 s (backtrack: 0/20).

[ebuild     U  ] app-admin/perl-cleaner-2.31-r3::gentoo [2.31-r2::gentoo] USE="-pkgcore" 7 KiB

Total: 1 package (1 upgrade), Size of downloads: 7 KiB