{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let_stmt.syntax().parent()?.ancestors().find_map(ast::BlockExpr::cast)?;"}]}
            let_stmt.syntax().parent()?.ancestors().find_map(ast::BlockExpr::cast)?;
        let parent_block =
        let parent_container = parent_block.syntax().parent()?;