fix ICE in rustdoc::invalid_html_tags

Author: lolbinarycat

src/librustdoc/passes/lint/html_tags.rs

@@ -364,6 +364,7 @@ impl TagParser {
             } else {
                 if !self.tag_name.is_empty() {
                     self.in_attrs = true;
+                    // range of the entire tag within dox
                     let mut r = Range { start: range.start + start_pos, end: range.start + pos };
                     if c == '>' {
                         // In case we have a tag without attribute, we can consider the span to
@@ -381,7 +382,7 @@ impl TagParser {
                             for (new_pos, c) in text[pos..].char_indices() {
                                 if !c.is_whitespace() {
                                     if c == '>' {
-                                        r.end = range.start + new_pos + 1;
+                                        r.end = range.start + pos + new_pos + 1;
                                         found = true;
                                     } else if c == '<' {
                                         self.handle_lt_in_tag(range.clone(), pos + new_pos, f);

tests/rustdoc-ui/lints/invalid-html-tags-ice-146890.rs

@@ -0,0 +1,24 @@
+// regression test for https://github.com/rust-lang/rust/issues/146890
+#[deny(rustdoc::invalid_html_tags)]
+
+/// <TABLE
+/// BORDER>
+/// <TR
+/// >
+/// <TH
+//~^ ERROR: unclosed HTML tag `TH`
+/// >key
+/// </TD
+//~^ ERROR: unopened HTML tag `TD`
+/// >
+/// <TH
+//~^ ERROR: unclosed HTML tag `TH`
+/// >value
+/// </TD
+//~^ ERROR: unopened HTML tag `TD`
+/// >
+/// </TR
+/// >
+/// </TABLE
+/// >
+pub fn foo() {}

tests/rustdoc-ui/lints/invalid-html-tags-ice-146890.stderr

@@ -0,0 +1,38 @@
+error: unopened HTML tag `TD`
+  --> $DIR/invalid-html-tags-ice-146890.rs:11:5
+   |
+LL |   /// </TD
+   |  _____^
+LL | |
+LL | | /// >
+   | |_____^
+   |
+note: the lint level is defined here
+  --> $DIR/invalid-html-tags-ice-146890.rs:2:8
+   |
+LL | #[deny(rustdoc::invalid_html_tags)]
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: unopened HTML tag `TD`
+  --> $DIR/invalid-html-tags-ice-146890.rs:17:5
+   |
+LL |   /// </TD
+   |  _____^
+LL | |
+LL | | /// >
+   | |_____^
+
+error: unclosed HTML tag `TH`
+  --> $DIR/invalid-html-tags-ice-146890.rs:8:5
+   |
+LL | /// <TH
+   |     ^^^
+
+error: unclosed HTML tag `TH`
+  --> $DIR/invalid-html-tags-ice-146890.rs:14:5
+   |
+LL | /// <TH
+   |     ^^^
+
+error: aborting due to 4 previous errors
+