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

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

[ebuild  N     ] perl-core/Scalar-List-Utils-1.680.0::gentoo  PERL_FEATURES="ithreads (-debug) -quadmath" 178 KiB
[ebuild     UD ] virtual/perl-Scalar-List-Utils-1.680.0::gentoo [1.680.100_rc::gentoo] 0 KiB
[blocks b      ] <perl-core/Scalar-List-Utils-1.680.100_rc ("<perl-core/Scalar-List-Utils-1.680.100_rc" is soft blocking virtual/perl-Scalar-List-Utils-1.680.100_rc)

Total: 2 packages (1 downgrade, 1 new), Size of downloads: 178 KiB
Conflict: 1 block (all satisfied)