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

Calculating dependencies ... done!
Dependency resolution took 1.03 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/yyjson-0.13.0:0/0.13::gentoo  USE="-doc -test" 1604 KiB
[ebuild  N     ] app-misc/fastfetch-2.61.0-r1::gentoo  USE="X dbus opengl sqlite xcb -chafa -ddcutil -drm -elf -gnome -imagemagick -opencl -pulseaudio -test -vulkan -wayland -xrandr" 1419 KiB

Total: 2 packages (2 new), Size of downloads: 3022 KiB