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fn main() {
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use ::std::io::Write;
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let (stderr, errmsg) = (&mut ::std::io::stderr(), "Error writing to stderr");
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writeln!(stderr, "Bye, world!").expect(errmsg);
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let (goodbye, world) = ("Goodbye", "world");
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writeln!(stderr, "{}, {}!", goodbye, world).expect(errmsg);
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}
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