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    // Copyright 2014-2017 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    mod dladdr;

    use sys::backtrace::BacktraceContext;
    use sys_common::backtrace::Frame;
    use io;

    #[cfg(target_os = "emscripten")]
    pub use self::dladdr::resolve_symname;

    #[cfg(target_os = "emscripten")]
    pub fn foreach_symbol_fileline<F>(_: Frame, _: F, _: &BacktraceContext) -> io::Result<bool>
    where
        F: FnMut(&[u8], u32) -> io::Result<()>
    {
        Ok(false)
    }

    #[cfg(not(target_os = "emscripten"))]
    pub use sys_common::gnu::libbacktrace::foreach_symbol_fileline;

    #[cfg(not(target_os = "emscripten"))]
    pub fn resolve_symname<F>(frame: Frame, callback: F, bc: &BacktraceContext) -> io::Result<()>
    where
        F: FnOnce(Option<&str>) -> io::Result<()>
    {
        ::sys_common::gnu::libbacktrace::resolve_symname(frame, |symname| {
            if symname.is_some() {
                callback(symname)
            } else {
                dladdr::resolve_symname(frame, callback, bc)
            }
        }, bc)
    }

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