tamer: ir::xir::reader: Disable quick-xml check_end_names

XIR must support tag mismatches; XIRT will validate them.

This is currently disabled in the linker's xmlo reader as well.

DEV-10863

tamer/src/ir/xir/reader.rs

@@ -65,8 +65,15 @@ pub struct XmlXirReader<B: BufRead> {
 
 impl<B: BufRead> XmlXirReader<B> {
     pub fn new(reader: B) -> Self {
+        let mut reader = quick_xml::Reader::from_reader(reader);
+
+        // XIR must support mismatched tags so that we are able to represent
+        //   and reconstruct malformed inputs.
+        // XIRT will handle mismatch errors itself.
+        reader.check_end_names(false);
+
         Self {
-            reader: quick_xml::Reader::from_reader(reader),
+            reader,
             readbuf: Vec::new(),
             // This capacity is largely arbitrary,
             //   but [`Token`]s are small enough that it likely does not

tamer/src/ir/xir/reader/test.rs

@@ -373,6 +373,24 @@ lines-->
     );
 }
 
+// XIRT handles mismatch errors; XIR must explicitly support them.
+#[test]
+fn permits_mismatched_tags() {
+    let sut = Sut::new(r#"<root><child /></mismatch>"#.as_bytes());
+
+    let result = sut.collect::<Result<Vec<_>>>();
+
+    assert_eq!(
+        result.expect("parsing failed"),
+        vec![
+            Token::Open("root".unwrap_into(), DUMMY_SPAN),
+            Token::Open("child".unwrap_into(), DUMMY_SPAN),
+            Token::Close(None, DUMMY_SPAN),
+            Token::Close(Some("mismatch".unwrap_into()), DUMMY_SPAN),
+        ],
+    );
+}
+
 // TODO: Enough information for error recovery and reporting.
 #[test]
 fn node_name_invalid_utf8() {