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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] dev-build/corrosion-0.6.1-r1::gentoo  USE="-debug -test" 101 KiB
[ebuild  N     ] app-i18n/libchewing-0.10.3:0/3::gentoo  USE="-debug -test" 22196 KiB

Total: 2 packages (2 new), Size of downloads: 22297 KiB