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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/List-SomeUtils-XS-0.590.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 166 KiB
[ebuild  N     ] dev-perl/Module-Runtime-0.18.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 27 KiB
[ebuild  N     ] dev-perl/Module-Implementation-0.90.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 19 KiB
[ebuild  N     ] dev-perl/List-SomeUtils-0.590.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 68 KiB

Total: 4 packages (4 new), Size of downloads: 279 KiB