Fix error message on unclosed JSX tag after closed tag

Related-to: syntax-tree/mdast-util-mdx-jsx@cdfd0e5.

src/to_mdast.rs

@@ -1743,12 +1743,13 @@ fn on_mismatch_error(
     right: &Event,
 ) -> Result<(), String> {
     if right.name == Name::MdxJsxFlowTag || right.name == Name::MdxJsxTextTag {
+        let stack = &context.jsx_tag_stack;
+        let tag = stack.last().unwrap();
         let point = if let Some(left) = left {
             &left.point
         } else {
             &context.events[context.events.len() - 1].point
         };
-        let tag = context.jsx_tag.as_ref().unwrap();
 
         return Err(format!(
             "{}:{}: Expected a closing tag for `{}` ({}:{}){} (mdx-jsx:end-tag-mismatch)",

tests/mdx_jsx_text.rs

@@ -483,6 +483,12 @@ fn mdx_jsx_text_core() -> Result<(), String> {
         "should crash when building the ast on mismatched interleaving (4)"
     );
 
+    assert_eq!(
+        to_mdast("<a><b></b>", &mdx.parse).err().unwrap(),
+        "1:11: Expected a closing tag for `<a>` (1:1) (mdx-jsx:end-tag-mismatch)",
+        "should crash on unclosed jsx after closed jsx"
+    );
+
     Ok(())
 }