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/Curses-1.460.0::gentoo  USE="unicode -examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 138 KiB
[ebuild  N     ] dev-perl/Curses-UI-0.960.900-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 153 KiB

Total: 2 packages (2 new), Size of downloads: 290 KiB