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-util/wayland-scanner-1.25.0::gentoo  596 KiB
[ebuild  N     ] dev-libs/wayland-1.25.0-r1::gentoo  USE="-doc (-selinux) -test" 0 KiB

Total: 2 packages (2 new), Size of downloads: 596 KiB