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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] dev-libs/c-blosc2-3.3.3:0/9::gentoo  USE="zlib zstd -test" 1904 KiB

Total: 2 packages (2 new), Size of downloads: 2282 KiB