Throwing std::ios_base::failure on formatted input with gcc 6.2

[Edward Diener <eldlistmailingz@xxxxxxxxxxxxxx>]

If I have code asuch as:

std::stringstream ss;
ss.exceptions(std::ios_base::failbit | std::ios_base::badbit);
char c;
ss >> c;

I would except an exception of std::ios_base::failure to be thrown yet 
gcc 6.2 is throwing some other exception. Is there a reason for this ?