error-fatality 0.1.2

Fatality extension to `thiserror::Error`
Documentation 
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// Copyright 2022 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.

use assert_matches::assert_matches;
use error_fatality::Fatality;
use thiserror::Error;

#[derive(Debug, Error)]
#[error("We tried")]
struct Fatal;

#[derive(Debug, Error)]
#[error("Get a dinosaur bandaid")]
struct Bobo;

#[derive(Debug, Error, Fatality)]
enum Kaboom {
	#[error(transparent)]
	#[fatal(false)]
	Iffy(#[from] Fatal),

	#[error(transparent)]
	#[fatal(false)]
	Bobo(#[from] Bobo),

	#[error("Message {0}")]
	#[fatal(false)]
	Eh(char),
}

fn iffy() -> Result<(), Kaboom> {
	Err(Fatal)?
}

fn bobo() -> Result<(), Kaboom> {
	Err(Bobo)?
}

fn oh_canada() -> Result<(), Kaboom> {
	Ok(Err(Kaboom::Eh('?'))?)
}

fn main() {
	if let Err(fatal) = iffy() {
		assert_matches!(fatal, Kaboom::Iffy(_));
	}
	if let Err(bobo) = bobo() {
		assert_matches!(bobo, Kaboom::Bobo(_));
	}
	if let Err(eh) = oh_canada() {
		assert_matches!(eh, Kaboom::Eh(_));
	}
}