comparing begin and end offsets for top-level sections and headlines.

src/parser/document.rs

@@ -74,6 +74,18 @@ impl<'s> Source<'s> for DocumentElement<'s> {
     }
 }
 
+impl<'s> Source<'s> for Section<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}
+
+impl<'s> Source<'s> for Heading<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}
+
 #[tracing::instrument(ret, level = "debug")]
 #[allow(dead_code)]
 pub fn document(input: &str) -> Res<&str, Document> {