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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/skalibs-2.15.0.0:0/2.15.0::gentoo  262 KiB
[ebuild  N     ] sys-apps/s6-portable-utils-2.3.1.2::gentoo  55 KiB
[ebuild  N     ] dev-lang/execline-2.9.9.1:0/2.9.0::gentoo  117 KiB
[ebuild  N     ] sys-apps/s6-2.15.0.0:0/2.15::gentoo  USE="execline" 271 KiB
[ebuild  N     ] app-containers/s6-overlay-2.1.0.2-r1::gentoo  30 KiB

Total: 5 packages (5 new), Size of downloads: 733 KiB