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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libsigc++-2.12.1:2::gentoo  USE="-gtk-doc -test" 4924 KiB
[ebuild  N     ] net-libs/net6-1.3.14-r2::gentoo  USE="nls" 473 KiB

Total: 2 packages (2 new), Size of downloads: 5396 KiB