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

Calculating dependencies ... done!
Dependency resolution took 0.98 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
[ebuild  N     ] dev-perl/HTTP-DAV-0.500.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 107 KiB

Total: 3 packages (3 new), Size of downloads: 226 KiB