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-rw-r--r--src/semantic/environment.rs5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/semantic/environment.rs b/src/semantic/environment.rs
index 7876ad4..1f9ade0 100644
--- a/src/semantic/environment.rs
+++ b/src/semantic/environment.rs
@@ -1,3 +1,8 @@
+// Copyright ⓒ 2017 David Li.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
use std::collections::HashMap;
use std::hash::Hash;