1 files changed, 23 insertions, 0 deletions
diff --git a/library/core/src/slice/specialize.rs b/library/core/src/slice/specialize.rs
new file mode 100644
index 000000000..80eb59058
--- /dev/null
+++ b/library/core/src/slice/specialize.rs
@@ -0,0 +1,23 @@
+pub(super) trait SpecFill<T> {
+    fn spec_fill(&mut self, value: T);
+}
+
+impl<T: Clone> SpecFill<T> for [T] {
+    default fn spec_fill(&mut self, value: T) {
+        if let Some((last, elems)) = self.split_last_mut() {
+            for el in elems {
+                el.clone_from(&value);
+            }
+
+            *last = value
+        }
+    }
+}
+
+impl<T: Copy> SpecFill<T> for [T] {
+    fn spec_fill(&mut self, value: T) {
+        for item in self.iter_mut() {
+            *item = value;
+        }
+    }
+}