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/Module-Runtime-0.18.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 27 KiB
[ebuild  N     ] dev-perl/boolean-0.460.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 16 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/Params-Validate-1.310.0::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 209 KiB
[ebuild  N     ] dev-perl/Math-Factor-XS-0.400.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 61 KiB

Total: 5 packages (5 new), Size of downloads: 330 KiB