{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
    let braces = prefix.char_indices().rev().skip_while(|&(_, c)| c.is_alphanumeric()).next_tuple();
    let prefix = &original.text()[..cursor_in_lit.into()];
    let brace_offset = match braces {