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

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

[ebuild  N     ] app-eselect/eselect-zig-2::gentoo  0 KiB
[ebuild  N     ] dev-lang/zig-0.15.1:0.15::gentoo  USE="-debug -doc -llvm -verify-sig" LLVM_SLOT="20" 20860 KiB

Total: 2 packages (2 new), Size of downloads: 20860 KiB