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diff --git a/vendor/ena/src/lib.rs b/vendor/ena/src/lib.rs
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+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! An implementation of union-find. See the `unify` module for more
+//! details.
+
+#![cfg_attr(feature = "bench", feature(test))]
+
+#[macro_use]
+extern crate log;
+
+#[cfg(feature = "persistent")]
+extern crate dogged;
+
+pub mod snapshot_vec;
+pub mod undo_log;
+pub mod unify;