Rename Red Knot (#17820)

crates/ty_python_semantic/src/node_key.rs

@@ -0,0 +1,21 @@
+use ruff_python_ast::AnyNodeRef;
+
+/// Compact key for a node for use in a hash map.
+///
+/// Stores the memory address of the node, because using the range and the kind
+/// of the node is not enough to uniquely identify them in ASTs resulting from
+/// invalid syntax. For example, parsing the input `for` results in a `StmtFor`
+/// AST node where both the `target` and the `iter` field are `ExprName` nodes
+/// with the same (empty) range `3..3`.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub(super) struct NodeKey(usize);
+
+impl NodeKey {
+    pub(super) fn from_node<'a, N>(node: N) -> Self
+    where
+        N: Into<AnyNodeRef<'a>>,
+    {
+        let node = node.into();
+        NodeKey(node.as_ptr().as_ptr() as usize)
+    }
+}