{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(index) = param_index.checked_sub(self.parent_count) {
    pub fn param_at(&'tcx self, param_index: usize, tcx: TyCtxt<'tcx>) -> &'tcx GenericParamDef {
            &self.own_params[index]