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diff --git a/third_party/rust/unicode-bidi/src/format_chars.rs b/third_party/rust/unicode-bidi/src/format_chars.rs
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+// Copyright 2017 The Servo 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.
+
+//! Directional Formatting Characters
+//!
+//! <http://www.unicode.org/reports/tr9/#Directional_Formatting_Characters>
+
+// == Implicit ==
+/// ARABIC LETTER MARK
+pub const ALM: char = '\u{061C}';
+/// LEFT-TO-RIGHT MARK
+pub const LRM: char = '\u{200E}';
+/// RIGHT-TO-LEFT MARK
+pub const RLM: char = '\u{200F}';
+
+// == Explicit Isolates ==
+/// LEFT‑TO‑RIGHT ISOLATE
+pub const LRI: char = '\u{2066}';
+/// RIGHT‑TO‑LEFT ISOLATE
+pub const RLI: char = '\u{2067}';
+/// FIRST STRONG ISOLATE
+pub const FSI: char = '\u{2068}';
+/// POP DIRECTIONAL ISOLATE
+pub const PDI: char = '\u{2069}';
+
+// == Explicit Embeddings and Overrides ==
+/// LEFT-TO-RIGHT EMBEDDING
+pub const LRE: char = '\u{202A}';
+/// RIGHT-TO-LEFT EMBEDDING
+pub const RLE: char = '\u{202B}';
+/// POP DIRECTIONAL FORMATTING
+pub const PDF: char = '\u{202C}';
+/// LEFT-TO-RIGHT OVERRIDE
+pub const LRO: char = '\u{202D}';
+/// RIGHT-TO-LEFT OVERRIDE
+pub const RLO: char = '\u{202E}';