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use io;
use sys::unsupported;
use sys_common::backtrace::Frame;
pub struct BacktraceContext;
pub fn unwind_backtrace(_frames: &mut [Frame])
-> io::Result<(usize, BacktraceContext)>
{
unsupported()
}
pub fn resolve_symname<F>(_frame: Frame,
_callback: F,
_: &BacktraceContext) -> io::Result<()>
where F: FnOnce(Option<&str>) -> io::Result<()>
{
unsupported()
}
pub fn foreach_symbol_fileline<F>(_: Frame,
_: F,
_: &BacktraceContext) -> io::Result<bool>
where F: FnMut(&[u8], u32) -> io::Result<()>
{
unsupported()
}