+ }
+ tt::TokenTree::Leaf(leaf) => {
+ let &(tt::Leaf::Ident(tt::Ident { id, .. })
+ | tt::Leaf::Punct(tt::Punct { id, .. })
+ | tt::Leaf::Literal(tt::Literal { id, .. })) = leaf;
+
+ (id != tt::TokenId::unspecified()).then(|| id.0)
+ }
+ };
+ subtree.token_trees.iter().filter_map(filter).max()