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

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

[ebuild     U  ] dev-libs/libffi-3.7.1:0/8::gentoo [3.5.2:0/8::gentoo] USE="exec-static-trampoline -debug -pax-kernel -static-libs -test" 1480 KiB

Total: 1 package (1 upgrade), Size of downloads: 1480 KiB