{"ast_node_type":"function","tokens":[{"end":91,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_const_operand(&mut self, constant: &ConstOperand<'tcx>, _location: Location) {
impl<'tcx> Visitor<'tcx> for ExtraComments<'tcx> {
        let ConstOperand { span, user_ty, const_ } = constant;