Switches are not stored for comment blocks, but they are allowed to appear.

org_mode_samples/lesser_element/lesser_block/comment/with_switches.org

@@ -0,0 +1,3 @@
+#+begin_comment -n 20
+foo
+#+end_comment

org_mode_samples/lesser_element/lesser_block/example/line_numbers.org

@@ -0,0 +1,7 @@
+#+begin_example -n 5
+foo
+#+end_example
+
+#+begin_example +n 10
+foo
+#+end_example

src/compare/diff.rs

@@ -1542,10 +1542,20 @@ fn compare_example_block<'b, 's>(
     emacs: &'b Token<'s>,
     rust: &'b ExampleBlock<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
-    let this_status = DiffStatus::Good;
-    let message = None;
+    let mut this_status = DiffStatus::Good;
+    let mut message = None;
 
-    // TODO: Compare :value :switches :number-lines :preserve-indent :retain-labels :use-labels :label-fmt
+    // TODO: Compare :switches :number-lines :preserve-indent :retain-labels :use-labels :label-fmt
+
+    // Compare value
+    let contents = get_property_quoted_string(emacs, ":value")?.unwrap_or(String::new());
+    if contents != rust.contents {
+        this_status = DiffStatus::Bad;
+        message = Some(format!(
+            "Value mismatch (emacs != rust) {:?} != {:?}",
+            contents, rust.contents
+        ));
+    }
 
     Ok(DiffResult {
         status: this_status,

src/parser/lesser_block.rs

@@ -95,7 +95,7 @@ pub(crate) fn comment_block<'b, 'g, 'r, 's>(
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, CommentBlock<'s>> {
     let (remaining, name) = lesser_block_begin("comment")(context, input)?;
-    let (remaining, parameters) = opt(tuple((space1, data)))(remaining)?;
+    let (remaining, _parameters) = opt(tuple((space1, data)))(remaining)?;
     let (remaining, _nl) = recognize(tuple((space0, line_ending)))(remaining)?;
     let lesser_block_end_specialized = lesser_block_end("comment");
     let contexts = [
@@ -109,10 +109,6 @@ pub(crate) fn comment_block<'b, 'g, 'r, 's>(
     let parser_context = context.with_additional_node(&contexts[0]);
     let parser_context = parser_context.with_additional_node(&contexts[1]);
     let parser_context = parser_context.with_additional_node(&contexts[2]);
-    let parameters = match parameters {
-        Some((_ws, parameters)) => Some(parameters),
-        None => None,
-    };
 
     let (remaining, contents) = parser_with_context!(text_until_exit)(&parser_context)(remaining)?;
     let (remaining, _end) = lesser_block_end_specialized(&parser_context, remaining)?;
@@ -123,7 +119,6 @@ pub(crate) fn comment_block<'b, 'g, 'r, 's>(
         CommentBlock {
             source: source.into(),
             name: name.into(),
-            data: parameters.map(|parameters| Into::<&str>::into(parameters)),
             contents: contents.into(),
         },
     ))

src/types/lesser_element.rs

@@ -33,7 +33,6 @@ pub struct VerseBlock<'s> {
 pub struct CommentBlock<'s> {
     pub source: &'s str,
     pub name: &'s str,
-    pub data: Option<&'s str>,
     pub contents: &'s str,
 }