{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"this.dcx().emit_err(UnexpectedDefaultValueForLifetimeInGenericParameters"}]}
                        this.dcx().emit_err(UnexpectedDefaultValueForLifetimeInGenericParameters {
                        let span = lo.to(this.prev_token.span);
                            span,