  Recently reported tentative evidence for a gamma-ray line in the Fermi-LAT
data is of great potential interest for identifying the nature of dark matter.
We compare the implications for decaying and annihilating dark matter taking
the constraints from continuum gamma-rays, antiproton flux and morphology of
the excess into account. We find that higgsino and wino dark matter are
excluded, also for nonthermal production. Generically, the continuum gamma-ray
flux severely constrains annihilating dark matter. Consistency of decaying dark
matter with the spatial distribution of the Fermi-LAT excess would require an
enhancement of the dark matter density near the Galactic center.
