Fix clippy warnings

src/utils/lines/spans/segment.rs

@@ -50,7 +50,7 @@ impl Segment {
     {
         let span = spans[self.span_id].as_ref();
 
-        if let &IndexedCow::Borrowed { start, .. } = span {
+        if let IndexedCow::Borrowed { start, .. } = *span {
             Some((self.start + start, self.end + start))
         } else {
             None

src/utils/lines/spans/segment_merge_iterator.rs

@@ -23,9 +23,7 @@ where
     fn next(&mut self) -> Option<Self::Item> {
         if self.current.is_none() {
             self.current = self.inner.next();
-            if self.current.is_none() {
-                return None;
-            }
+            self.current?;
         }
 
         loop {

src/utils/span.rs

@@ -49,6 +49,12 @@ where
     r: &'a C,
 }
 
+impl<T> Default for SpannedString<T> {
+    fn default() -> Self {
+        SpannedString::new()
+    }
+}
+
 impl<'a, T> SpannedText for &'a SpannedString<T> {
     type S = IndexedSpan<T>;