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

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/nanomsg-1.2.2:0/6.0.1::gentoo  USE="-doc -test" 303 KiB

Total: 1 package (1 new), Size of downloads: 303 KiB