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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] app-arch/lz4-1.10.0-r1:0/1.10.0-meson::gentoo  USE="-static-libs -test" 379 KiB
[ebuild  N     ] dev-scheme/chez-10.4.1:0/10.4.1::gentoo  USE="X ncurses threads" 9361 KiB
[ebuild  N     ] dev-scheme/chez-minikanren-2018.04.11::gentoo  USE="-source" 14 KiB

Total: 3 packages (3 new), Size of downloads: 9752 KiB