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

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

[ebuild     UD ] dev-libs/libyaml-0.2.2::gentoo [0.2.5::gentoo] USE="-doc -static-libs -test" 78 KiB

Total: 1 package (1 downgrade), Size of downloads: 78 KiB