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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/blake3-1.8.7::gentoo  USE="-test" 263 KiB
[ebuild  N     ] dev-util/shadowman-5::gentoo  4 KiB
[ebuild  N     ] dev-cpp/expected-1.3.1::gentoo  24 KiB
[ebuild  N     ] dev-util/ccache-4.13.5::gentoo  USE="http static-c++ -doc -redis -test -verify-sig" 614 KiB

Total: 4 packages (4 new), Size of downloads: 903 KiB