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

Calculating dependencies ... done!
Dependency resolution took 1.10 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/range-v3-0.12.0-r1::gentoo  USE="-test" 570 KiB

Total: 1 package (1 new), Size of downloads: 570 KiB