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use std::error::Error; use std::fmt; #[derive(Debug, Clone)] pub struct PngError { description: String, } impl Error for PngError { #[inline] fn description(&self) -> &str { &self.description } } impl fmt::Display for PngError { #[inline] fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}", self.description) } } impl PngError { #[inline] pub fn new(description: &str) -> PngError { PngError { description: description.to_owned(), } } }