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

Calculating dependencies ... done!
Dependency resolution took 1.52 s (backtrack: 0/20).

[ebuild     UD ] sys-apps/grep-3.11-r1::gentoo [3.12::gentoo] USE="egrep-fgrep nls pcre -static -verify-sig (-test-full%)" 1664 KiB

Total: 1 package (1 downgrade), Size of downloads: 1664 KiB