improvements recommended by clippy

src/lib.rs

@@ -6,6 +6,10 @@ pub struct LinkerSetIter<T> {
 }
 
 impl<T> LinkerSetIter<T> {
+    /// Create a new iterator for a linker set.
+    ///
+    /// # Safety
+    /// The pointers must be start and end pointers generated by the linker.
     pub unsafe fn new(start: *const T, stop: *const T) -> Self {
         assert!(start < stop);
         Self { next: start, stop }
@@ -65,6 +69,10 @@ impl<T> LinkerSet<T>
 where
     T: 'static,
 {
+    /// Create a new object to represent a linker set.
+    ///
+    /// # Safety
+    /// The pointers must be start and end pointers generated by the linker.
     pub unsafe fn new(start: *const T, stop: *const T) -> Self {
         assert!(start < stop);
         let len = stop.offset_from(start).try_into().unwrap();
@@ -79,6 +87,10 @@ where
     pub fn len(&self) -> usize {
         self.slice.len()
     }
+
+    pub fn is_empty(&self) -> bool {
+        self.start == self.stop
+    }
 }
 
 impl<T> IntoIterator for LinkerSet<T>
@@ -194,6 +206,11 @@ mod test {
         assert_eq!(actual, expect);
     }
 
+    #[test]
+    fn test_is_empty() {
+        assert!(!set!(stuff).is_empty());
+    }
+
     #[derive(Debug, Eq, PartialEq, Hash)]
     pub(crate) struct Foo {
         a: u32,