diff -r bfef9f34e438 -r 2d2eaba76d70 rust/parameter-lister/src/outputmodule.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/parameter-lister/src/outputmodule.rs	Sat Oct 01 16:19:20 2016 +0200
@@ -0,0 +1,22 @@
+/**
+ * parameter-lister (Rust implementation)
+ * Copyright © 2016 Vojtěch Král <vojtech@kral.hk>
+ *
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+pub use std::io::Write;
+
+pub trait OutputModule {
+	fn process(&self, output: &mut Write, parameters: Vec<String>) -> Result<(), String>;
+}