fix(rust): correctly highlight escaped backslash char literals

src/languages/rust.js

@@ -1,3 +1,4 @@
+// @ts-nocheck
 /*
 Language: Rust
 Author: Andrey Vlasovskikh <andrey.vlasovskikh@gmail.com>
@@ -6,6 +7,7 @@ Website: https://www.rust-lang.org
 Category: common, system
 */
 
+/** @typedef {import('highlight.js').LanguageFn} LanguageFn */
 /** @type LanguageFn */
 
 export default function(hljs) {
@@ -213,7 +215,8 @@ export default function(hljs) {
             contains: [
               {
                 scope: "char.escape",
-                match: /\\('|\w|x\w{2}|u\w{4}|U\w{8})/
+                // Match escape sequences: \\ \' \n \r \t \0 \xHH \u{HHHHHH}
+                match: /\\([\\'"nrt0]|x[0-9a-fA-F]{2}|u\{[0-9a-fA-F]{1,6}\})/
               }
             ]
           }

test/markup/rust/escape-backslash.expect.txt

@@ -0,0 +1,3 @@
+<span class="hljs-keyword">if</span> text.<span class="hljs-title function_ invoke__">contains</span>(<span class="hljs-string">&#x27;<span class="hljs-char escape_">\\</span>&#x27;</span>) || text.<span class="hljs-title function_ invoke__">contains</span>(<span class="hljs-string">&#x27;/&#x27;</span>) {
+    <span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;found a slash&quot;</span>);
+}

test/markup/rust/escape-backslash.txt

@@ -0,0 +1,3 @@
+if text.contains('\\') || text.contains('/') {
+    println!("found a slash");
+}

test/markup/rust/lifetimes.expect.txt

@@ -0,0 +1,17 @@
+<span class="hljs-keyword">fn</span> <span class="hljs-title function_">longest</span>&lt;<span class="hljs-symbol">&#x27;a</span>&gt;(x: &amp;<span class="hljs-symbol">&#x27;a</span> <span class="hljs-type">str</span>, y: &amp;<span class="hljs-symbol">&#x27;a</span> <span class="hljs-type">str</span>) <span class="hljs-punctuation">-&gt;</span> &amp;<span class="hljs-symbol">&#x27;a</span> <span class="hljs-type">str</span> {
+    <span class="hljs-keyword">if</span> x.<span class="hljs-title function_ invoke__">len</span>() &gt; y.<span class="hljs-title function_ invoke__">len</span>() { x } <span class="hljs-keyword">else</span> { y }
+}
+
+<span class="hljs-keyword">struct</span> <span class="hljs-title class_">ImportantExcerpt</span>&lt;<span class="hljs-symbol">&#x27;a</span>&gt; {
+    part: &amp;<span class="hljs-symbol">&#x27;a</span> <span class="hljs-type">str</span>,
+}
+
+<span class="hljs-keyword">impl</span>&lt;<span class="hljs-symbol">&#x27;a</span>&gt; ImportantExcerpt&lt;<span class="hljs-symbol">&#x27;a</span>&gt; {
+    <span class="hljs-keyword">fn</span> <span class="hljs-title function_">level</span>(&amp;<span class="hljs-keyword">self</span>) <span class="hljs-punctuation">-&gt;</span> <span class="hljs-type">i32</span> {
+        <span class="hljs-number">3</span>
+    }
+}
+
+<span class="hljs-keyword">fn</span> <span class="hljs-title function_">static_lifetime</span>() <span class="hljs-punctuation">-&gt;</span> &amp;<span class="hljs-symbol">&#x27;static</span> <span class="hljs-type">str</span> {
+    <span class="hljs-string">&quot;I have a static lifetime.&quot;</span>
+}

test/markup/rust/lifetimes.txt

@@ -0,0 +1,17 @@
+fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+    if x.len() > y.len() { x } else { y }
+}
+
+struct ImportantExcerpt<'a> {
+    part: &'a str,
+}
+
+impl<'a> ImportantExcerpt<'a> {
+    fn level(&self) -> i32 {
+        3
+    }
+}
+
+fn static_lifetime() -> &'static str {
+    "I have a static lifetime."
+}

test/markup/rust/macros.expect.txt

@@ -0,0 +1,16 @@
+<span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;Hello, world!&quot;</span>);
+<span class="hljs-built_in">vec!</span>[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>];
+<span class="hljs-built_in">assert_eq!</span>(x, y);
+dbg!(my_variable);
+
+<span class="hljs-built_in">macro_rules!</span> say_hello {
+    () =&gt; {
+        <span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;Hello!&quot;</span>);
+    };
+}
+
+<span class="hljs-meta">#[derive(Debug, Clone)]</span>
+<span class="hljs-keyword">struct</span> <span class="hljs-title class_">Point</span> {
+    x: <span class="hljs-type">i32</span>,
+    y: <span class="hljs-type">i32</span>,
+}

test/markup/rust/macros.txt

@@ -0,0 +1,16 @@
+println!("Hello, world!");
+vec![1, 2, 3];
+assert_eq!(x, y);
+dbg!(my_variable);
+
+macro_rules! say_hello {
+    () => {
+        println!("Hello!");
+    };
+}
+
+#[derive(Debug, Clone)]
+struct Point {
+    x: i32,
+    y: i32,
+}

test/markup/rust/strings.expect.txt

@@ -1,8 +1,8 @@
 <span class="hljs-string">&#x27;a&#x27;</span>;
 <span class="hljs-string">&#x27;<span class="hljs-char escape_">\n</span>&#x27;</span>;
-<span class="hljs-string">&#x27;<span class="hljs-char escape_">\x</span>1A&#x27;</span>;
-<span class="hljs-string">&#x27;<span class="hljs-char escape_">\u</span>12AS&#x27;</span>;
-<span class="hljs-string">&#x27;<span class="hljs-char escape_">\U</span>1234ASDF&#x27;</span>;
+<span class="hljs-string">&#x27;<span class="hljs-char escape_">\x1A</span>&#x27;</span>;
+<span class="hljs-string">&#x27;\u12AS&#x27;</span>;
+<span class="hljs-string">&#x27;\U1234ASDF&#x27;</span>;
 <span class="hljs-string">&#x27;😭&#x27;</span>;
 <span class="hljs-string">b&#x27;a&#x27;</span>;