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

Calculating dependencies ... done!
Dependency resolution took 1.61 s (backtrack: 0/20).

[ebuild     U  ] app-arch/libarchive-3.8.10:0/13::gentoo [3.8.6:0/13::gentoo] USE="acl bzip2 e2fsprogs iconv lzma xattr zstd -blake2 -expat -lz4 -lzo -nettle -static-libs -test -verify-sig" 6578 KiB

Total: 1 package (1 upgrade), Size of downloads: 6578 KiB