Remove WeightedTreeIndex::new_empty method

Author: newpavlov

rand_distr/src/weighted_tree.rs

@@ -97,13 +97,6 @@ pub struct WeightedTreeIndex<
 impl<W: Clone + PartialEq + PartialOrd + SampleUniform + SubAssign<W> + Weight>
     WeightedTreeIndex<W>
 {
-    /// Creates a new [`WeightedTreeIndex`] without weights.
-    pub fn new_empty() -> Self {
-        Self {
-            subtotals: Vec::new(),
-        }
-    }
-
     /// Creates a new [`WeightedTreeIndex`] from a slice of weights.
     ///
     /// Error cases:
@@ -310,7 +303,8 @@ mod test {
     #[test]
     fn test_no_item_error() {
         let mut rng = crate::test::rng(0x9c9fa0b0580a7031);
-        let tree = WeightedTreeIndex::<f64>::new_empty();
+        #[allow(clippy::needless_borrows_for_generic_args)]
+        let tree = WeightedTreeIndex::<f64>::new(&[]).unwrap();
         assert_eq!(
             tree.try_sample(&mut rng).unwrap_err(),
             WeightError::InsufficientNonZero
@@ -345,7 +339,8 @@ mod test {
             WeightedTreeIndex::<i32>::new([1, -1]).unwrap_err(),
             WeightError::InvalidWeight
         );
-        let mut tree = WeightedTreeIndex::<i32>::new_empty();
+        #[allow(clippy::needless_borrows_for_generic_args)]
+        let mut tree = WeightedTreeIndex::<i32>::new(&[]).unwrap();
         assert_eq!(tree.push(-1).unwrap_err(), WeightError::InvalidWeight);
         tree.push(1).unwrap();
         assert_eq!(tree.update(0, -1).unwrap_err(), WeightError::InvalidWeight);