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diff --git a/vendor/unic-char-range/src/macros.rs b/vendor/unic-char-range/src/macros.rs
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+// Copyright 2017 The UNIC Project Developers.
+//
+// See the COPYRIGHT file at the top-level directory of this distribution.
+//
+// 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.
+
+#[macro_export]
+/// Convenience macro for the initialization of `CharRange`s.
+///
+/// # Syntax
+///
+/// ```
+/// # #[macro_use] extern crate unic_char_range;
+/// # fn main() {
+/// chars!('a'..'z'); // The half open range including 'a' and excluding 'z'
+/// chars!('a'..='z'); // The closed range including 'a' and including 'z'
+/// chars!(..); // All characters
+/// # }
+/// ```
+///
+/// `chars!('a'..='z')` and `chars!(..)` are constant-time expressions, and can be used
+/// where such are required, such as in the initialization of constant data structures.
+///
+/// NOTE: Because an `expr` capture cannot be followed by a `..`/`..=`, this macro captures token
+/// trees. This means that if you want to pass more than one token, you must parenthesize it (e.g.
+/// `chars!('\0' ..= (char::MAX))`).
+macro_rules! chars {
+    ( $low:tt .. $high:tt ) => {
+        $crate::CharRange::open_right($low, $high)
+    };
+    ( $low:tt ..= $high:tt ) => {
+        $crate::CharRange {
+            low: $low,
+            high: $high,
+        }
+    };
+    ( .. ) => {
+        $crate::CharRange::all()
+    };
+}