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/YAML-PP-0.39.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 212 KiB
[ebuild  N     ] dev-perl/XXX-0.380.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 15 KiB
[ebuild  N     ] dev-perl/Pegex-0.750.0-r1::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 146 KiB

Total: 3 packages (3 new), Size of downloads: 372 KiB