Remover is_empty method from BitSetLike, it does not work on non BitSet

src/lib.rs

@@ -245,6 +245,11 @@ impl<T: UnsignedInteger> GenericBitSet<T> {
         self.layer3 = T::ZERO;
     }
 
+    ///  Returns true if this `BitSet` contains nothing, and false otherwise.
+    pub fn is_empty(&self) -> bool {
+        self.layer3 == T::ZERO
+    }
+
     /// How many bits are in a `usize`.
     ///
     /// This value can be trivially determined. It is provided here as a constant for clarity.
@@ -423,11 +428,6 @@ pub trait BitSetLike {
         }
     }
 
-    /// Returns true if this `BitSetLike` contains nothing, and false otherwise.
-    fn is_empty(&self) -> bool {
-        self.layer3() == Self::Underlying::ZERO
-    }
-
     /// Return a `usize` where each bit represents if any word in layer2
     /// has been set.
     fn layer3(&self) -> Self::Underlying;