errore 0.4.1

Library for error handling and tracing
Documentation 
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use std::error::Error as StdError;
use std::io;

use errore::prelude::*;

#[test]
fn test_implicit_source() {
    #[derive(Error, Debug)]
    #[error("implicit source")]
    pub struct ImplicitSource {
        source: io::Error,
    }

    let io = io::Error::new(io::ErrorKind::Other, "oh no!");
    let error = ImplicitSource { source: io };
    error.source().unwrap().downcast_ref::<io::Error>().unwrap();
}

#[test]
fn test_explicit_source() {
    #[derive(Error, Debug)]
    #[error("explicit source")]
    pub struct ExplicitSource {
        source: String,
        #[source]
        io: io::Error,
    }

    let io = io::Error::new(io::ErrorKind::Other, "oh no!");
    let error = ExplicitSource {
        source: String::new(),
        io,
    };
    error.source().unwrap().downcast_ref::<io::Error>().unwrap();
}

#[test]
fn test_boxed_source() {
    #[derive(Error, Debug)]
    #[error("boxed source")]
    pub struct BoxedSource {
        #[source]
        source: Box<dyn StdError + Send + 'static + Send + Sync>,
    }

    let source = Box::new(io::Error::new(io::ErrorKind::Other, "oh no!"));
    let error = BoxedSource { source };
    error.source().unwrap().downcast_ref::<io::Error>().unwrap();
}

macro_rules! error_from_macro {
    ($($variants:tt)*) => {
        #[derive(Error)]
        #[derive(Debug)]
        pub enum MacroSource {
            $($variants)*
        }
    }
}

// Test that we generate impls with the proper hygiene
#[rustfmt::skip]
error_from_macro! {
    #[error("Something")]
    Variant(#[from] io::Error)
}