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

Calculating dependencies  ..... done!
[binary   R    ] dev-libs/libffi-3.0.11  USE="-debug -static-libs {-test}" 0 kB
[binary   R    ] virtual/libffi-3.0.11  0 kB

Total: 2 packages (2 reinstalls, 2 binaries), Size of downloads: 0 kB