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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild   R    ] sys-apps/grep-3.12::gentoo  USE="egrep-fgrep nls pcre -static -test-full -verify-sig" 1874 KiB

Total: 1 package (1 reinstall), Size of downloads: 1874 KiB