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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/IO-Multiplex-1.160.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 16 KiB
[ebuild  N     ] app-misc/conmux-0.16.4::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 14356 KiB

Total: 2 packages (2 new), Size of downloads: 14371 KiB