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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     UD ] sys-apps/hwdata-0.399::gentoo [0.400::gentoo] 2473 KiB

Total: 1 package (1 downgrade), Size of downloads: 2473 KiB