{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"self.set_tainted_by_errors(guar);"}]}
                self.set_tainted_by_errors(guar);
                    self.dcx().span_delayed_bug(path_span, "`Res::Err` but no error emitted");
                return Err(guar);