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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Device-SerialPort-1.40.0-r4::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 97 KiB
[ebuild  N     ] dev-perl/Time-TAI64-2.110.0-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 6 KiB
[ebuild  N     ] dev-perl/WattsUp-Daemon-0.4-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 14 KiB

Total: 3 packages (3 new), Size of downloads: 116 KiB