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/aws-c-common-1.0.3:0/1.0::gentoo  USE="-test" 641 KiB
[ebuild  N     ] dev-libs/aws-checksums-0.2.10-r1:0/1::gentoo  USE="-test" 214 KiB

Total: 2 packages (2 new), Size of downloads: 855 KiB