https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51553
david.d.kretzmer at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |david.d.kretzmer at gmail dot com --- Comment #4 from david.d.kretzmer at gmail dot com --- 13.3.3.1 p4 [over.best.ics] [...] or when the initializer list has exactly one element and a conversion to some class X or reference to (possibly cv-qualified) X is considered for the first parameter of a constructor of X, or by 13.3.1.4, 13.3.1.5, or 13.3.1.6 in all cases, only standard conversion sequences and ellipsis conversion sequences are considered. If I understand this correctly then the behavior before gcc 4.7 was actually correct: only standard conversions are considered, conversion functions are not.