[Bug libstdc++/57953] no C++11 compliant std::ios_base::failure found

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57953

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to unixway.drive+gcc from comment #0)
> §27.5.3 states that "ios_base defines <...> a class failure derived from
> system_error".

And http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011
states this isn't implemented yet.