{"ast_node_type":"other","tokens":[{"end":13,"kind":"keyword","start":0,"text":"}"}]}
            }
                Some(Box::new(AttrInput::TokenTree(tt::TopSubtree::from_subtree(tree))))
            (Some(tt::TokenTree::Leaf(tt::Leaf::Punct(tt::Punct { char: '=', .. }))), _) => {