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

Calculating dependencies ... done!
Dependency resolution took 1.58 s (backtrack: 0/20).

[ebuild  NS    ] sys-fs/fuse-2.9.9-r2:0::gentoo [3.18.1:3/4::gentoo] USE="-examples% -static-libs% (-io-uring%) (-suid%*) (-systemtap%) (-test%)" 1774 KiB
[ebuild  N     ] net-fs/s3backer-2.1.3::gentoo  USE="-nbd" 154 KiB

Total: 2 packages (1 new, 1 in new slot), Size of downloads: 1927 KiB