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use thiserror::Error;
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macro_rules! error_type {
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($name:ident, $what:expr) => {
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// Use #[error("invalid {}", $what)] instead.
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#[derive(Error, Debug)]
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#[error(concat!("invalid ", $what))]
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pub struct $name;
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};
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}
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error_type!(Error, "foo");
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fn main() {}
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