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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/pugixml-1.16::gentoo  USE="-test" 575 KiB
[ebuild  N     ] sci-libs/libecpint-1.0.6-r1::gentoo  USE="-test" 1300 KiB

Total: 2 packages (2 new), Size of downloads: 1875 KiB