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/UNIVERSAL-require-0.190.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 7 KiB
[ebuild  N     ] dev-perl/Algorithm-Diff-1.201.0::gentoo  USE="-examples" PERL_FEATURES="ithreads (-debug) -quadmath" 30 KiB
[ebuild  N     ] dev-perl/FileHandle-Unget-0.163.400-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 42 KiB
[ebuild  N     ] dev-perl/Text-Diff-1.450.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 29 KiB
[ebuild  N     ] dev-perl/Mail-Mbox-MessageParser-1.511.100::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 290 KiB

Total: 5 packages (5 new), Size of downloads: 396 KiB