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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] app-arch/pigz-2.8::gentoo  USE="-static -test -verify-sig" 119 KiB

Total: 1 package (1 new), Size of downloads: 119 KiB