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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     UD ] dev-perl/Unicode-LineBreak-2019.1.0-r1::gentoo [2019.1.0-r2::gentoo] USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 305 KiB

Total: 1 package (1 downgrade), Size of downloads: 305 KiB