Initial code structure for regular links.

src/compare/diff.rs

@@ -1071,13 +1071,23 @@ fn compare_strike_through<'s>(
 }
 
 fn compare_regular_link<'s>(
-    _source: &'s str,
-    _emacs: &'s Token<'s>,
-    _rust: &'s RegularLink<'s>,
+    source: &'s str,
+    emacs: &'s Token<'s>,
+    rust: &'s RegularLink<'s>,
 ) -> Result<DiffResult, Box<dyn std::error::Error>> {
+    let mut this_status = DiffStatus::Good;
+    let emacs_name = "link";
+    if assert_name(emacs, emacs_name).is_err() {
+        this_status = DiffStatus::Bad;
+    }
+
+    if assert_bounds(source, emacs, rust).is_err() {
+        this_status = DiffStatus::Bad;
+    }
+
     Ok(DiffResult {
-        status: DiffStatus::Good,
-        name: "regular-link".to_owned(),
+        status: this_status,
+        name: emacs_name.to_owned(),
         message: None,
         children: Vec::new(),
     })

src/parser/object.rs

@@ -111,3 +111,9 @@ impl<'s> Source<'s> for Verbatim<'s> {
         self.source
     }
 }
+
+impl<'s> Source<'s> for RegularLink<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}