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use crate::io; use crate::sys::unsupported; use crate::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() }