From 32da06776c1b1a47d1bff3a094be2f977a6ed157 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Wed, 4 Oct 2023 14:49:08 -0400
Subject: [PATCH] Handle matching no switches.

---
 .../example/space_for_parameters.org          |  2 ++
 src/compare/diff.rs                           | 20 +++++++++++++------
 src/parser/lesser_block.rs                    |  2 ++
 3 files changed, 18 insertions(+), 6 deletions(-)
 create mode 100644 org_mode_samples/lesser_element/lesser_block/example/space_for_parameters.org

diff --git a/org_mode_samples/lesser_element/lesser_block/example/space_for_parameters.org b/org_mode_samples/lesser_element/lesser_block/example/space_for_parameters.org
new file mode 100644
index 00000000..cdd859bd
--- /dev/null
+++ b/org_mode_samples/lesser_element/lesser_block/example/space_for_parameters.org
@@ -0,0 +1,2 @@
+#+begin_example 
+#+end_example
diff --git a/src/compare/diff.rs b/src/compare/diff.rs
index 938622d8..6b5487f1 100644
--- a/src/compare/diff.rs
+++ b/src/compare/diff.rs
@@ -1559,12 +1559,20 @@ fn compare_example_block<'b, 's>(
 
     // Compare switches
     let switches = get_property_quoted_string(emacs, ":switches")?;
-    if switches.as_ref().map(String::as_str) != rust.switches {
-        this_status = DiffStatus::Bad;
-        message = Some(format!(
-            "Switches mismatch (emacs != rust) {:?} != {:?}",
-            switches, rust.switches
-        ));
+    match (switches.as_ref().map(String::as_str), rust.switches) {
+        (None, None) => {}
+        (Some(""), None) => {}
+        (None, Some("")) => {
+            unreachable!("The organic parser would return a None instead of an empty string.");
+        }
+        (Some(e), Some(r)) if e == r => {}
+        _ => {
+            this_status = DiffStatus::Bad;
+            message = Some(format!(
+                "Switches mismatch (emacs != rust) {:?} != {:?}",
+                switches, rust.switches
+            ));
+        }
     }
 
     // Compare number-lines
diff --git a/src/parser/lesser_block.rs b/src/parser/lesser_block.rs
index 48869658..0dde4a0d 100644
--- a/src/parser/lesser_block.rs
+++ b/src/parser/lesser_block.rs
@@ -326,6 +326,7 @@ fn _lesser_block_begin<'b, 'g, 'r, 's, 'c>(
     Ok((remaining, name))
 }
 
+#[derive(Debug)]
 struct ExampleSwitches<'s> {
     source: &'s str,
     number_lines: Option<SwitchNumberLines>,
@@ -334,6 +335,7 @@ struct ExampleSwitches<'s> {
     label_format: Option<&'s str>,
 }
 
+#[derive(Debug)]
 enum SwitchState {
     Normal,
     NewLineNumber,