Initial commit

crates/std/src/arena/macros.rs

@@ -0,0 +1,20 @@
+/// Combination of pointers.
+#[macro_export]
+#[doc(hidden)]
+macro_rules! _make_comb {
+    ($(
+        $item:item
+    )*) => {$(
+        #[derive(
+            Debug,
+            Clone,
+            Copy,
+            PartialEq,
+            Eq,
+            PartialOrd,
+            Ord,
+            Hash,
+        )]
+        $item
+    )*};
+}