Fix tests

src/lib.rs

@@ -48,6 +48,11 @@ pub mod raw {
     pub use inner::*;
 
     #[cfg(feature = "rayon")]
+    /// [rayon]-based parallel iterator types for hash maps.
+    /// You will rarely need to interact with it directly unless you have need
+    /// to name one of the iterator types.
+    ///
+    /// [rayon]: https://docs.rs/rayon/1.0/rayon
     pub mod rayon {
         pub use crate::external_trait_impls::rayon::raw::*;
     }

src/raw/mod.rs

@@ -1707,7 +1707,7 @@ impl<T> Iterator for RawIterRange<T> {
                 // than the group size where the trailing control bytes are all
                 // EMPTY. On larger tables self.end is guaranteed to be aligned
                 // to the group size (since tables are power-of-two sized).
-                if let None = self.inner.next_group() {
+                if self.inner.next_group().is_none() {
                     return None;
                 }
                 self.data = self.data.next_n(Group::WIDTH);