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

Calculating dependencies ... done!
Dependency resolution took 1.49 s (backtrack: 0/20).

[ebuild     UD ] llvm-core/llvm-common-21.1.8::gentoo [22.1.1::gentoo] USE="-emacs -verify-sig" 155233 KiB

Total: 1 package (1 downgrade), Size of downloads: 155233 KiB