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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/blake3-1.8.7::gentoo  USE="-test" 263 KiB
[ebuild  N     ] dev-util/xdelta-3.2.2:3::gentoo  USE="-examples -lzma -test" 221 KiB

Total: 2 packages (2 new), Size of downloads: 483 KiB