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

Calculating dependencies ... done!
Dependency resolution took 1.51 s (backtrack: 0/20).

[ebuild     UD ] dev-lang/nasm-2.16.03::gentoo [3.01::gentoo] USE="-doc" 1009 KiB

Total: 1 package (1 downgrade), Size of downloads: 1009 KiB