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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/IO-stringy-2.113.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 47 KiB
[ebuild  N     ] dev-perl/MIME-Types-2.290.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 68 KiB
[ebuild  N     ] dev-perl/Hash-Ordered-0.14.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 36 KiB
[ebuild  N     ] dev-perl/User-Identity-1.30.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 29 KiB
[ebuild  N     ] dev-perl/Mail-Message-3.17.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 264 KiB
[ebuild  N     ] dev-perl/Mail-Transport-3.5.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 17 KiB

Total: 6 packages (6 new), Size of downloads: 459 KiB