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

Calculating dependencies ... done!
Dependency resolution took 1.53 s (backtrack: 0/20).

[ebuild  N     ] perl-core/Compress-Raw-Zlib-2.212.0::gentoo  PERL_FEATURES="ithreads (-debug) -quadmath" 539 KiB
[ebuild     UD ] virtual/perl-Compress-Raw-Zlib-2.212.0-r1::gentoo [2.213.0-r1::gentoo] 0 KiB
[blocks b      ] <perl-core/Compress-Raw-Zlib-2.213.0 ("<perl-core/Compress-Raw-Zlib-2.213.0" is soft blocking virtual/perl-Compress-Raw-Zlib-2.213.0-r1)

Total: 2 packages (1 downgrade, 1 new), Size of downloads: 539 KiB
Conflict: 1 block (all satisfied)