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

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

[ebuild  N     ] dev-libs/tree-sitter-regex-1.0.0::gentoo  USE="-test" 20 KiB

Total: 1 package (1 new), Size of downloads: 20 KiB