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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/unibilium-2.1.4:0/4::gentoo  124 KiB
[ebuild  N     ] dev-libs/libtermkey-0.22-r2::gentoo  USE="-demos" 46 KiB
[ebuild  N     ] app-editors/vis-0.9-r2::gentoo  USE="acl ncurses -lua (-selinux) -test -tre" LUA_SINGLE_TARGET="lua5-4 -lua5-3" 447 KiB

Total: 3 packages (3 new), Size of downloads: 615 KiB