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/libaio-0.3.113_p8::gentoo  USE="-static-libs -test" 74 KiB
[ebuild  N     ] app-benchmarks/stress-ng-0.21.04::gentoo  USE="jpeg -apparmor -keyutils -sctp" 8305 KiB

Total: 2 packages (2 new), Size of downloads: 8378 KiB