Retain labels stays a boolean without -r.

src/compare/diff.rs

@@ -1626,7 +1626,7 @@ fn compare_example_block<'b, 's>(
     }
 
     // Compare retain-labels
-    // retain-labels is t by default, nil if -r is set, or a number if -k is set.
+    // retain-labels is t by default, nil if -r is set, or a number if -k and -r is set.
     let retain_labels = get_property_unquoted_atom(emacs, ":retain-labels")?;
     if let Some(retain_labels) = retain_labels {
         if retain_labels == "t" {
@@ -1652,7 +1652,6 @@ fn compare_example_block<'b, 's>(
                     ));
                 }
             }
-            // foo
         }
     } else {
         match rust.retain_labels {