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/Module-CPANfile-1.100.400-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 23 KiB
[ebuild  N     ] dev-perl/ExtUtils-MakeMaker-CPANfile-0.90.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 12 KiB

Total: 2 packages (2 new), Size of downloads: 34 KiB