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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Math-BigInt-GMP-1.700.300::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 2576 KiB
[ebuild  N     ] dev-perl/Math-ModInt-0.13.0-r1::gentoo  USE="-minimal -test" PERL_FEATURES="ithreads (-debug) -quadmath" 52 KiB

Total: 2 packages (2 new), Size of downloads: 2628 KiB