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fix(args): use eprintln for printing error messages in args module
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@ -134,7 +134,7 @@ impl Args {
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println!("{}", usage);
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None
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} else if !required_args_present {
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println!(
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eprintln!(
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"{}: no variables specified\n\
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Try `{} --help' for more information.",
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env!("CARGO_PKG_NAME"),
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