{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"self.tcx.dcx().emit_err(errors::FieldAlreadyDeclared::NotNested"}]}
                self.tcx.dcx().emit_err(errors::FieldAlreadyDeclared::NotNested {
            (NotNested(span), Some(NotNested(prev_span))) => {
                    field_name,