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-4.13.2-r1:4/4.13.2::gentoo  USE="-test" 3108 KiB

Total: 1 package (1 new), Size of downloads: 3108 KiB