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

Calculating dependencies ... done!
Dependency resolution took 1.55 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     ] sys-fs/lufis-0.3-r1::gentoo  18 KiB
[ebuild  N     ] sys-fs/lufs-0.9.7-r4::gentoo  USE="-debug" 526 KiB

Total: 3 packages (2 new, 1 in new slot), Size of downloads: 2317 KiB