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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/File-Copy-Recursive-0.450.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 19 KiB
[ebuild  N     ] dev-perl/File-Remove-1.610.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 26 KiB
[ebuild  N     ] dev-perl/prefork-1.50.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 28 KiB
[ebuild  N     ] dev-perl/File-Flat-1.70.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 50 KiB

Total: 4 packages (4 new), Size of downloads: 122 KiB