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

Calculating dependencies ... done!
Dependency resolution took 1.56 s (backtrack: 0/20).

[ebuild     U  ] dev-libs/icu-78.3:0/78::gentoo [78.2:0/78::gentoo] USE="-debug -doc -examples -static-libs -test -verify-sig" 27322 KiB

Total: 1 package (1 upgrade), Size of downloads: 27322 KiB