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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Data-Random-0.150.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 157 KiB
[ebuild  N     ] dev-perl/HTML-Form-6.130.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 46 KiB
[ebuild  N     ] dev-perl/WWW-Mechanize-FormFiller-0.130.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 20 KiB

Total: 3 packages (3 new), Size of downloads: 222 KiB