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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Heap-0.800.0-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 16 KiB
[ebuild  N     ] dev-perl/Set-Object-1.430.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 82 KiB
[ebuild  N     ] dev-perl/Graph-0.973.500::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 149 KiB

Total: 3 packages (3 new), Size of downloads: 246 KiB