Remove some allocations

crates/stdx/src/lib.rs

@@ -193,6 +193,11 @@ where
     }
 }
 
+/// Returns all final segments of the argument, longest first.
+pub fn slice_tails<T>(this: &[T]) -> impl Iterator<Item = &[T]> {
+    (0..this.len()).map(|i| &this[i..])
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;