{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"[tt::TokenTree::Leaf(tt::Leaf::Ident(ident))]"}]}
                [tt::TokenTree::Leaf(tt::Leaf::Ident(ident))] => Some(ident),
            AttrInput::TokenTree(tt) => match tt.token_trees().flat_tokens() {
                _ => None,