Which is this: http://msdn.microsoft.com/en-US/library/c8105dy3%28v=vs.90%29.aspx

> qualifier applied to function type has no meaning; ignored
> 
> A qualifier, such as const, is applied to a function type defined by typedef.

Doesn't seem to apply, though.

it does break later commits at least in MSVC, I've just found out.