error-chain 0.7.1

Yet another error boilerplate library.
Documentation 
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#[macro_use]
extern crate error_chain;

use std::mem::{size_of, size_of_val};

error_chain! {
    errors {
        AVariant
        Another
    }
}

fn main() {
    println!("Memory usage in bytes");
    println!("---------------------");
    println!("Result<()>: {}", size_of::<Result<()>>());
    println!("  (): {}", size_of::<()>());
    println!("  Error: {}", size_of::<Error>());
    println!("    ErrorKind: {}", size_of::<ErrorKind>());
    let msg = ErrorKind::Msg("test".into());
    println!("      ErrorKind::Msg: {}", size_of_val(&msg));
    println!("        String: {}", size_of::<String>());
    println!("    State: {}", size_of::<error_chain::State>());
    #[cfg(feature = "backtrace")]
    {
        let state = error_chain::State {
            next_error: None,
            backtrace: None,
        };
        println!("      State.next_error: {}", size_of_val(&state.next_error));
        println!("      State.backtrace: {}", size_of_val(&state.backtrace));
    }
    #[cfg(not(feature = "backtrace"))]
    {
        let state = error_chain::State {
            next_error: None,
        };
        println!("      State.next_error: {}", size_of_val(&state.next_error));
    }
}