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

Calculating dependencies ... done!
Dependency resolution took 1.52 s (backtrack: 0/20).

[ebuild     U  ] dev-libs/expat-2.9.0::gentoo [2.7.4::gentoo] USE="unicode -examples -static-libs -test" 522 KiB

Total: 1 package (1 upgrade), Size of downloads: 522 KiB