{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"self.tcx.dcx().emit_err(errors::FieldAlreadyDeclared::PreviousNested"}]}
                self.tcx.dcx().emit_err(errors::FieldAlreadyDeclared::PreviousNested {
            (NotNested(span), Some(Nested(prev))) => {
                    field_name,