Rust: expand attribute macros on AssocItem

misc/codegen/templates/ql_parent.mustache

@@ -63,7 +63,7 @@ none()
 {{#classes}}
     {{#final}}
         or
-        result = getImmediateChildOf{{name}}(e, index, partialAccessor)
+        index = min(int i | result = getImmediateChildOf{{name}}(e, i, partialAccessor) | i)
     {{/final}}
 {{/classes}}
 }

rust/downgrades/ecb8241bf0be2db7cde671a45c2912c72672422a/downgrade.ql

@@ -0,0 +1,7 @@
+class Element extends @element {
+  string toString() { none() }
+}
+
+query predicate new_item_attribute_macro_expansions(Element id, Element attribute_macro_expansion) {
+  expandable_item_attribute_macro_expansions(id, attribute_macro_expansion) and id instanceof @item
+}