{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> LateLintPass<'tcx> for DefaultCouldBeDerived {
    fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {