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-scheme/racket-9.3:0/9.3::gentoo  USE="chez doc futures iconv jit ncurses places threads -minimal" 159477 KiB
[ebuild  N     ] dev-lang/arc-3.2-r1::gentoo  270 KiB

Total: 2 packages (2 new), Size of downloads: 159747 KiB