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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Guard-1.23.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 7 KiB
[ebuild  N     ] dev-perl/Canary-Stability-2013.0.0::gentoo  PERL_FEATURES="ithreads (-debug) -quadmath" 5 KiB
[ebuild  N     ] dev-perl/common-sense-3.750.0::gentoo  PERL_FEATURES="ithreads (-debug) -quadmath" 14 KiB
[ebuild  N     ] dev-perl/AnyEvent-7.170.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 298 KiB
[ebuild  N     ] dev-perl/EV-4.370.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 217 KiB
[ebuild  N     ] dev-perl/Coro-6.570.0-r1::gentoo  USE="ev -event -examples -test -valgrind" PERL_FEATURES="ithreads (-debug) -quadmath" 194 KiB

Total: 6 packages (6 new), Size of downloads: 733 KiB