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

Calculating dependencies ... done!
Dependency resolution took 1.51 s (backtrack: 0/20).

[ebuild     UD ] net-libs/nghttp3-1.8.0::gentoo [1.15.0::gentoo] USE="-static-libs% -test% (-verify-sig%)" 390 KiB

Total: 1 package (1 downgrade), Size of downloads: 390 KiB