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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Cache-FastMmap-1.600.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 56 KiB

Total: 1 package (1 new), Size of downloads: 56 KiB