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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/simdjson-4.3.0:0/30::gentoo  USE="all-impls -test -tools" 12986 KiB

Total: 1 package (1 new), Size of downloads: 12986 KiB