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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libyuv-1904-r1:0/1904::gentoo  USE="-test" 452 KiB

Total: 1 package (1 new), Size of downloads: 452 KiB