{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"if"}]}
        if let hir::Pat { kind: hir::PatKind::Ref(_, _), span, .. } = param.pat
    fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) -> Self::Result {
            && *span == self.span