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use std::error::Error as StdError; use std::fmt; use std::io; #[derive(Debug)] pub enum Error { IoError(io::Error), } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { Error::IoError(err) => write!(f, "{}", err), } } } impl StdError for Error { fn source(&self) -> Option<&(dyn StdError + 'static)> { None } } impl From<io::Error> for Error { fn from(error: io::Error) -> Self { Error::IoError(error) } }