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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     U  ] net-dns/libidn-1.44:0/12::gentoo [1.43:0/12::gentoo] USE="nls -emacs -verify-sig" 2540 KiB

Total: 1 package (1 upgrade), Size of downloads: 2540 KiB