Added splicing helper that uses Clone instead of Copy.

src/mutators/helpers.rs

@@ -62,6 +62,45 @@ pub fn splice_extend<C: Copy>(
     Some(((dst_start..dst_end), (src_start..src_end)))
 }
 
+/// Copy a random sub-slice from `src` into a random subslice of `dst`.
+/// This will potentially grow or shrink the destination vector.
+/// This will call clone on every element. Use [`splice_extend`] if your type is `Copy` for better
+/// performance.
+#[inline]
+pub fn splice_clone_extend<C: Clone>(
+    dst: &mut Vec<C>,
+    src: &[C],
+    rng: &mut impl rand::Rng,
+) -> Option<(std::ops::Range<usize>, std::ops::Range<usize>)> {
+    if src.is_empty() {
+        return None;
+    }
+
+    let src_start = rng.gen_range(0..src.len());
+    let src_end = rng.gen_range(src_start..=src.len());
+    if dst.is_empty() {
+        dst.extend(
+            src.iter()
+                .skip(src_start)
+                .take(src_end - src_start)
+                .cloned(),
+        );
+        return Some((0..0, src_start..src_end));
+    }
+
+    let dst_start = rng.gen_range(0..dst.len());
+    let dst_end = rng.gen_range(dst_start..=dst.len());
+
+    dst.splice(
+        dst_start..dst_end,
+        src.iter()
+            .skip(src_start)
+            .take(src_end - src_start)
+            .cloned(),
+    );
+    Some(((dst_start..dst_end), (src_start..src_end)))
+}
+
 /// Copy sub-slice from another slice into the current one.
 ///
 /// # returns