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-libs/capnproto-1.4.0:0/1.4.0::gentoo  USE="ssl zlib -test" 2367 KiB

Total: 1 package (1 new), Size of downloads: 2367 KiB