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use std::error::Error; use std::fmt::{Debug, Display, Formatter}; #[derive(Default)] pub struct AssertionError { pub message: String, } impl AssertionError { pub fn new(message: String) -> Self { Self { message } } } impl Display for AssertionError { fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "{}", self.message) } } impl Debug for AssertionError { fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "{}", self.message) } } impl Error for AssertionError { fn source(&self) -> Option<&(dyn Error + 'static)> { None } }