{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
        let flag = sess.opts.cg.collapse_macro_debuginfo;
    fn get_collapse_debuginfo(sess: &Session, attrs: &[hir::Attribute], ext: bool) -> bool {
        let attr = ast::attr::find_by_name(attrs, sym::collapse_debuginfo)