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

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

[ebuild  N     ] sys-cluster/gasnet-1.32.0:0/1.32.0::gentoo  USE="threads -mpi -test" 2600 KiB

Total: 1 package (1 new), Size of downloads: 2600 KiB