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/XML-NamespaceSupport-1.120.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 18 KiB
[ebuild  N     ] dev-perl/XML-SAX-Base-1.90.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 28 KiB
[ebuild  N     ] dev-perl/XML-SAX-1.20.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 47 KiB
[ebuild  N     ] dev-perl/XML-SAX-Expat-0.510.0-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 7 KiB

Total: 4 packages (4 new), Size of downloads: 99 KiB