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

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] x11-themes/hicolor-icon-theme-0.17::gentoo  52 KiB
[ebuild  N     ] x11-themes/gargantuan-icon-theme-1.7::gentoo  15052 KiB

Total: 2 packages (2 new), Size of downloads: 15104 KiB