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tokens: It is a pleasure to thank Seppo Mattila, Rubina Kotak, Nancy Elias-Rosa, Stephen Smartt, Anders Jerkstrand, John Eldridge and Justyn Maund for useful discussions and comments on this work, and Gerry Gilmore for ongoing support. We thank the anonymous referee for a careful reading of the Letter. This Letter is based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 094.D-0351. This work was partly supported by the European Union FP7 programme through ERC grant number 320360.