Remove unused parens

Author: cuviper

src/rayon/set.rs

@@ -497,7 +497,7 @@ where
 }
 
 /// Requires crate feature `"rayon"`.
-impl<T, S> ParallelExtend<(T)> for IndexSet<T, S>
+impl<T, S> ParallelExtend<T> for IndexSet<T, S>
 where
     T: Eq + Hash + Send,
     S: BuildHasher + Send,

src/set.rs

@@ -328,7 +328,7 @@ where
     }
 
     /// Return item index
-    pub fn entry_index<Q: ?Sized>(&self, value: &Q) -> Option<(usize)>
+    pub fn entry_index<Q: ?Sized>(&self, value: &Q) -> Option<usize>
     where
         Q: Hash + Equivalent<T>,
     {