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

Calculating dependencies ... done!
Dependency resolution took 0.95 s (backtrack: 0/20).

[ebuild   R    ] dev-util/re2c-3.1::gentoo  USE="-debug -test" 1415 KiB

Total: 1 package (1 reinstall), Size of downloads: 1415 KiB