http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56466
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> 2013-02-26 18:15:28 UTC --- Unsurprisingly started with http://gcc.gnu.org/viewcvs?view=revision&revision=195880, but must have been latent before.