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/XML-RegExp-0.40.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 4 KiB
[ebuild  N     ] dev-perl/XML-DOM-1.460.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 115 KiB

Total: 2 packages (2 new), Size of downloads: 119 KiB