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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libaio-0.3.113_p8::gentoo  USE="-static-libs -test" 74 KiB
[ebuild  N     ] dev-util/stressapptest-1.0.11::gentoo  USE="-debug" 226 KiB

Total: 2 packages (2 new), Size of downloads: 299 KiB