From c09549a187e62d39d40467f129e64abf32efc35c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20L=C3=B3pez?= <carlos.lopez@suse.com>
Date: Thu, 1 Jun 2023 14:17:14 +0200
Subject: [PATCH] Avoid panic when displaying unexpected token error

Avoid entering unreachable!() when displaying an error message for an
invalid `<!` token. This fixes a panic when processing a malformed
XML which contains such token in an unexpected place, like the
following:

`<!DOCTYPEs/%<!A`
---
 src/reader/lexer.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/reader/lexer.rs b/src/reader/lexer.rs
index f6ce5fe9..a8345ba4 100644
--- a/src/reader/lexer.rs
+++ b/src/reader/lexer.rs
@@ -81,6 +81,7 @@ impl fmt::Display for Token {
                 Token::EqualsSign                 => "=",
                 Token::SingleQuote                => "'",
                 Token::DoubleQuote                => "\"",
+                Token::MarkupDeclarationStart     => "<!",
                 _                          => unreachable!()
             }.fmt(f),
         }