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

Calculating dependencies ... done!
Dependency resolution took 1.70 s (backtrack: 0/20).

[ebuild  NS    ] dev-lang/python-3.12.15:3.12::gentoo [3.13.12:3.13::gentoo, 3.14.3:3.14::gentoo] USE="ensurepip gdbm ncurses pgo readline sqlite ssl -bluetooth -debug -examples -libedit -test -tk -valgrind -verify-sig (-jit%) (-tail-call-interp%)" LLVM_SLOT="(-19%*)" 20356 KiB
[ebuild  N     ] dev-build/gn-0.2122::gentoo  724 KiB

Total: 2 packages (1 new, 1 in new slot), Size of downloads: 21079 KiB