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

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] app-text/wdiff-1.2.3::gentoo  USE="-experimental -test" 1670 KiB
[ebuild  N     ] dev-perl/File-LibMagic-1.230.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 164 KiB
[ebuild  N     ] dev-util/pkgdiff-1.8::gentoo  103 KiB

Total: 3 packages (3 new), Size of downloads: 1937 KiB