wherror 2.4.0

The same derive(Error) macro thiserror provides + the features you want!
Documentation 
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use core::fmt::{self, Display};
use wherror::Error;

#[derive(Error, Debug)]
#[error]
pub struct MyError;

impl Display for MyError {
    fn fmt(&self, _formatter: &mut fmt::Formatter) -> fmt::Result {
        unimplemented!()
    }
}

fn main() {}