thiserror 1.0.8

derive(Error)
Documentation 
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use thiserror::Error;

#[derive(Error, Debug)]
#[error("...")]
pub struct ErrorStruct {
    source: String,
}

#[derive(Error, Debug)]
#[error("...")]
pub enum ErrorEnum {
    Broken {
        source: String,
    },
}

fn main() {}