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// Copyright 2019-2020 Parity Technologies (UK) Ltd. // This file is part of Substrate. // Substrate 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. // Substrate 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 Substrate. If not, see <http://www.gnu.org/licenses/>. /// State Machine Errors use std::fmt; /// State Machine Error bound. /// /// This should reflect Wasm error type bound for future compatibility. pub trait Error: 'static + fmt::Debug + fmt::Display + Send {} impl<T: 'static + fmt::Debug + fmt::Display + Send> Error for T {} /// Externalities Error. /// /// Externalities are not really allowed to have errors, since it's assumed that dependent code /// would not be executed unless externalities were available. This is included for completeness, /// and as a transition away from the pre-existing framework. #[derive(Debug, Eq, PartialEq)] pub enum ExecutionError { /// Backend error. Backend(String), /// The entry `:code` doesn't exist in storage so there's no way we can execute anything. CodeEntryDoesNotExist, /// Backend is incompatible with execution proof generation process. UnableToGenerateProof, /// Invalid execution proof. InvalidProof, } impl fmt::Display for ExecutionError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Externalities Error") } }