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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libdatrie-0.2.14-r1:0/1::gentoo  USE="-doc" 319 KiB
[ebuild  N     ] dev-libs/libthai-0.1.30::gentoo  USE="-doc" 770 KiB

Total: 2 packages (2 new), Size of downloads: 1088 KiB