{"ast_node_type":"function","tokens":[{"end":70,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) -> Self::Result {
impl<'tcx> Visitor<'tcx> for DanglingPointerReturnSearcher<'_, 'tcx> {
        if let ExprKind::Ret(Some(expr)) = expr.kind {