Fixed warnings (#3345)

substrate/core/cli/src/execution_strategy.rs

@@ -0,0 +1,35 @@
+// Copyright 2018-2019 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/>.
+
+#![allow(missing_docs)]
+
+use structopt::clap::{arg_enum, _clap_count_exprs};
+
+arg_enum! {
+	/// How to execute blocks
+	#[derive(Debug, Clone, Copy)]
+	pub enum ExecutionStrategy {
+		// Execute with native build (if available, WebAssembly otherwise).
+		Native,
+		// Only execute with the WebAssembly build.
+		Wasm,
+		// Execute with both native (where available) and WebAssembly builds.
+		Both,
+		// Execute with the native build if possible; if it fails, then execute with WebAssembly.
+		NativeElseWasm,
+	}
+}
+