{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"cx.dcx().emit_err(session_diagnostics::RustcAllowedUnstablePairing"}]}
                cx.dcx().emit_err(session_diagnostics::RustcAllowedUnstablePairing {
            } else {
                    span: cx.target_span,