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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-build/bmake-20260912::gentoo  USE="-test" LUA_SINGLE_TARGET="lua5-1 -lua5-3 -lua5-4 -luajit" 990 KiB
[ebuild  N     ] app-text/lowdown-3.2.1:0/4::gentoo  767 KiB
[ebuild  N     ] sys-process/btop-1.4.7::gentoo  USE="-test" 1251 KiB

Total: 3 packages (3 new), Size of downloads: 3006 KiB