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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] llvm-runtimes/clang-stdlib-config-18:18::gentoo  USE="-default-libcxx" 0 KiB

Total: 1 package (1 new), Size of downloads: 0 KiB