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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/File-Next-1.180.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 18 KiB
[ebuild  N     ] sys-apps/ack-3.10.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 274 KiB
[ebuild  N     ] app-vim/ackvim-1.0.9-r2::gentoo  10 KiB

Total: 3 packages (3 new), Size of downloads: 301 KiB