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

Calculating dependencies ... done!
Dependency resolution took 1.08 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/nanomsg-1.2.2:0/6.0.1::gentoo  USE="-doc -test" 303 KiB
[ebuild  N     ] net-libs/llhttp-9.4.3:0/9.4::gentoo  40 KiB
[ebuild  N     ] dev-libs/libgit2-1.9.7:0/1.9::gentoo  USE="ssh -examples -gssapi -test -trace" 7588 KiB
[ebuild  N     ] dev-libs/boxfort-0.1.5::gentoo  USE="-test" 43 KiB
[ebuild  N     ] dev-libs/criterion-2.4.1-r1::gentoo  USE="-test" 2051 KiB

Total: 5 packages (5 new), Size of downloads: 10023 KiB