{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let mut trees = if cfg_attr.style == AttrStyle::Inner {
        // For inner attributes, we do the same thing for the `!` in `#![attr]`.
            let Some(TokenTree::Token(bang_token @ Token { kind: TokenKind::Bang, .. }, _)) =