{"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"None"}]}
            None => {
            None if let Some(e) = self.tainted_by_errors() => Ty::new_error(self.tcx, e),
                bug!("no type for node {} in fcx {}", self.tcx.hir_id_to_string(id), self.tag());