{"ast_node_type":"function","tokens":[{"end":74,"kind":"keyword","start":0,"text":"fn"}]}
    fn check_expr(&mut self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) {
impl LateLintPass<'_> for QueryStability {
        let Some((span, def_id, args)) = typeck_results_of_method_fn(cx, expr) else { return };