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

Calculating dependencies ... done!
Dependency resolution took 1.49 s (backtrack: 0/20).

[ebuild     UD ] sys-apps/locale-gen-3.9-r2::gentoo [3.10::gentoo] 18 KiB

Total: 1 package (1 downgrade), Size of downloads: 18 KiB