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pub struct Error { repr: Repr } use core::fmt; impl fmt::Debug for Error { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Debug::fmt(&self.repr, f) } } #[derive(Debug)] enum Repr { Simple(ErrorKind), } #[non_exhaustive] #[derive(Debug)] pub enum ErrorKind { NotFound, PermissionDenied, ConnectionRefused, ConnectionReset, ConnectionAborted, NotConnected, AddrInUse, AddrNotAvailable, BrokenPipe, AlreadyExists, WouldBlock, InvalidInput, InvalidData, TimedOut, WriteZero, Interrupted, Other, UnexpectedEof, } impl Error { pub fn new<A>(kind: ErrorKind, _: A) -> Self { Self { repr: Repr::Simple(kind) } } }