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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/IO-Interface-1.90.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 17 KiB
[ebuild  N     ] dev-perl/Net-Pcap-0.210.0::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 96 KiB
[ebuild  N     ] dev-perl/Net-ARP-1.0.12::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 17 KiB

Total: 3 packages (3 new), Size of downloads: 129 KiB