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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/antlr-cpp-4.11.1:4::gentoo  USE="-test" 522 KiB

Total: 1 package (1 new), Size of downloads: 522 KiB