Correctly handle unicode characters and tags being open just before the end of the doc comment

src/test/rustdoc-ui/invalid-html-tags.rs

@@ -1,5 +1,8 @@
 #![deny(invalid_html_tags)]
 
+//! <p>💩<p>
+//~^ ERROR unclosed HTML tag `p`
+
 /// <img><input>
 /// <script>
 /// <img><input>
@@ -38,6 +41,8 @@ pub fn b() {}
 //~^ ERROR unclosed HTML tag `div`
 ///   <h3>
 //~^ ERROR unclosed HTML tag `h3`
+/// <script
+//~^ ERROR unclosed HTML tag `script`
 pub fn c() {}
 
 // Unclosed tags shouldn't warn if they are nested inside a <script> elem.
@@ -55,7 +60,7 @@ pub fn d() {}
 /// <style>
 ///   <h3><div>
 /// </style>
-/// <style>
+/// <stYle>
 ///   <div>
 ///     <p>
 ///   </div>

src/test/rustdoc-ui/invalid-html-tags.stderr

@@ -1,8 +1,8 @@
-error: unclosed HTML tag `unknown`
-  --> $DIR/invalid-html-tags.rs:7:5
+error: unclosed HTML tag `p`
+  --> $DIR/invalid-html-tags.rs:3:5
    |
-LL | /// <unknown>
-   |     ^^^^^^^^^
+LL | //! <p>💩<p>
+   |     ^^^
    |
 note: the lint level is defined here
   --> $DIR/invalid-html-tags.rs:1:9
@@ -10,47 +10,59 @@ note: the lint level is defined here
 LL | #![deny(invalid_html_tags)]
    |         ^^^^^^^^^^^^^^^^^
 
-error: unclosed HTML tag `script`
+error: unclosed HTML tag `unknown`
   --> $DIR/invalid-html-tags.rs:10:5
    |
+LL | /// <unknown>
+   |     ^^^^^^^^^
+
+error: unclosed HTML tag `script`
+  --> $DIR/invalid-html-tags.rs:13:5
+   |
 LL | /// <script>
    |     ^^^^^^^^
 
 error: unclosed HTML tag `h2`
-  --> $DIR/invalid-html-tags.rs:15:7
+  --> $DIR/invalid-html-tags.rs:18:7
    |
 LL | ///   <h2>
    |       ^^^^
 
 error: unclosed HTML tag `h3`
-  --> $DIR/invalid-html-tags.rs:17:9
+  --> $DIR/invalid-html-tags.rs:20:9
    |
 LL | ///     <h3>
    |         ^^^^
 
 error: unopened HTML tag `hello`
-  --> $DIR/invalid-html-tags.rs:20:5
+  --> $DIR/invalid-html-tags.rs:23:5
    |
 LL | /// </hello>
    |     ^^^^^^^^
 
 error: unclosed HTML tag `p`
-  --> $DIR/invalid-html-tags.rs:25:14
+  --> $DIR/invalid-html-tags.rs:28:14
    |
 LL | ///    <br/> <p>
    |              ^^^
 
 error: unclosed HTML tag `div`
-  --> $DIR/invalid-html-tags.rs:37:5
+  --> $DIR/invalid-html-tags.rs:40:5
    |
 LL | /// <div style="hello">
    |     ^^^^
 
 error: unclosed HTML tag `h3`
-  --> $DIR/invalid-html-tags.rs:39:7
+  --> $DIR/invalid-html-tags.rs:42:7
    |
 LL | ///   <h3>
    |       ^^^^
 
-error: aborting due to 8 previous errors
+error: unclosed HTML tag `script`
+  --> $DIR/invalid-html-tags.rs:44:5
+   |
+LL | /// <script
+   |     ^^^^^^
+
+error: aborting due to 10 previous errors