{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
    let block_expr = ast::BlockExpr::cast(token.parent_ancestors().nth(1)?)?;
fn join_single_expr_block(edit: &mut TextEditBuilder, token: &SyntaxToken) -> Option<()> {
    if !block_expr.is_standalone() {