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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] app-arch/snappy-1.2.2:0/1.1::gentoo  USE="-test" CPU_FLAGS_X86="avx avx2" 1083 KiB

Total: 1 package (1 new), Size of downloads: 1083 KiB