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/bitset-2.8.4-r4::gentoo  USE="-static-libs -tcmalloc" 37 KiB

Total: 1 package (1 new), Size of downloads: 37 KiB