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/libevdev-1.13.7::gentoo  USE="-doc -test" 462 KiB
[ebuild  N     ] dev-libs/libgudev-238-r2::gentoo  USE="-introspection -test" 30 KiB
[ebuild  N     ] dev-libs/libwacom-2.18.0:0/9::gentoo  USE="-doc -test" 178 KiB

Total: 3 packages (3 new), Size of downloads: 669 KiB