diff --git a/benches/xml.rs b/benches/xml.rs
index b2d5577..b8c09a7 100644
--- a/benches/xml.rs
+++ b/benches/xml.rs
@@ -399,12 +399,7 @@ benchmark_group!(
     large_sdx_document,
     huge_sdx_document,
 );
-benchmark_group!(
-    minidom,
-    tiny_minidom,
-    medium_minidom,
-    large_minidom,
-);
+benchmark_group!(minidom, tiny_minidom, medium_minidom, large_minidom,);
 benchmark_group!(
     xmlparser,
     tiny_xmlparser,
diff --git a/src/parse.rs b/src/parse.rs
index b42932d..97146bb 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -80,6 +80,9 @@ pub enum Error {
     /// The XML document must have at least one element.
     NoRootNode,
 
+    /// The root node was opened but never closed.
+    UnclosedRootNode,
+
     /// An XML with DTD detected.
     ///
     /// This error will be emitted only when `ParsingOptions::allow_dtd` is set to `false`.
@@ -194,6 +197,9 @@ impl core::fmt::Display for Error {
             Error::NoRootNode => {
                 write!(f, "the document does not have a root node")
             }
+            Error::UnclosedRootNode => {
+                write!(f, "the root node was opened but never closed")
+            }
             Error::DtdDetected => {
                 write!(f, "XML with DTD detected")
             }
@@ -521,6 +527,10 @@ fn parse(text: &str, opt: ParsingOptions) -> Result<Document, Error> {
         return Err(Error::NoRootNode);
     }
 
+    if pd.parent_prefixes.len() > 1 {
+        return Err(Error::UnclosedRootNode);
+    }
+
     doc.nodes.shrink_to_fit();
     doc.attrs.shrink_to_fit();
     doc.namespaces.shrink_to_fit();
@@ -1002,6 +1012,7 @@ impl<'input, 'temp> BorrowedText<'input, 'temp> {
     }
 }
 
+#[allow(clippy::needless_lifetimes)]
 fn append_text<'input, 'temp>(
     text: BorrowedText<'input, 'temp>,
     parent_id: NodeId,
@@ -1174,8 +1185,8 @@ fn _normalize_attribute(
     Ok(())
 }
 
-fn get_ns_idx_by_prefix<'input>(
-    doc: &Document<'input>,
+fn get_ns_idx_by_prefix(
+    doc: &Document,
     range: ShortRange,
     prefix: StrSpan,
 ) -> Result<Option<NamespaceIdx>, Error> {
diff --git a/tests/api.rs b/tests/api.rs
index 22d1bf5..4e5360e 100644
--- a/tests/api.rs
+++ b/tests/api.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::bool_assert_comparison)]
+
 extern crate roxmltree;
 
 use roxmltree::*;
diff --git a/tests/ast.rs b/tests/ast.rs
index dfb99da..90914c9 100644
--- a/tests/ast.rs
+++ b/tests/ast.rs
@@ -40,7 +40,7 @@ fn actual_test(path: &str) {
         ..roxmltree::ParsingOptions::default()
     };
 
-    let input_xml = load_file(&path);
+    let input_xml = load_file(path);
     let doc = match Document::parse_with_options(&input_xml, opt) {
         Ok(v) => v,
         Err(e) => {
@@ -53,7 +53,7 @@ fn actual_test(path: &str) {
 }
 
 fn load_file(path: &path::Path) -> String {
-    let mut file = fs::File::open(&path).unwrap();
+    let mut file = fs::File::open(path).unwrap();
     let mut text = String::new();
     file.read_to_string(&mut text).unwrap();
     text
@@ -117,7 +117,7 @@ fn _to_yaml(doc: &Document, s: &mut String) -> Result<(), fmt::Error> {
                     }
 
                     let attributes = child.attributes();
-                    if !(attributes.len() == 0) {
+                    if attributes.len() != 0 {
                         let mut attrs = Vec::new();
                         for attr in attributes {
                             match attr.namespace() {
@@ -149,7 +149,7 @@ fn _to_yaml(doc: &Document, s: &mut String) -> Result<(), fmt::Error> {
                             };
                             ns_list.push((name, uri));
                         }
-                        ns_list.sort_by(|a, b| a.0.cmp(&b.0));
+                        ns_list.sort_by(|a, b| a.0.cmp(b.0));
 
                         writeln_indented!(depth + 2, s, "namespaces:");
                         for (name, uri) in ns_list {
@@ -288,3 +288,5 @@ test!(tree_001);
 test!(tree_002);
 // test!(tree_003); // unsupported
 test!(tree_err_001);
+test!(tree_err_002);
+test!(tree_err_003);
diff --git a/tests/files/README.md b/tests/files/README.md
index a6f30e0..950fc20 100644
--- a/tests/files/README.md
+++ b/tests/files/README.md
@@ -85,3 +85,5 @@
 - tree_002 - BOM
 - tree_003 - Windows-1251 encoding
 - tree_err_001 - no elements
+- tree_err_002 - root element not closed
+- tree_err_003 - child element not closed
diff --git a/tests/files/tree_err_002.xml b/tests/files/tree_err_002.xml
new file mode 100644
index 0000000..e1856eb
--- /dev/null
+++ b/tests/files/tree_err_002.xml
@@ -0,0 +1,2 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<open>Text
diff --git a/tests/files/tree_err_002.yaml b/tests/files/tree_err_002.yaml
new file mode 100644
index 0000000..a80ea7b
--- /dev/null
+++ b/tests/files/tree_err_002.yaml
@@ -0,0 +1 @@
+error: "the root node was opened but never closed"
diff --git a/tests/files/tree_err_003.xml b/tests/files/tree_err_003.xml
new file mode 100644
index 0000000..7cb568e
--- /dev/null
+++ b/tests/files/tree_err_003.xml
@@ -0,0 +1,2 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<root><open>Text</root>
diff --git a/tests/files/tree_err_003.yaml b/tests/files/tree_err_003.yaml
new file mode 100644
index 0000000..b93f025
--- /dev/null
+++ b/tests/files/tree_err_003.yaml
@@ -0,0 +1 @@
+error: "expected 'open' tag, not 'root' at 2:17"