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-misc/colordiff-1.0.22::gentoo  USE="-verify-sig" 25 KiB

Total: 1 package (1 new), Size of downloads: 25 KiB