{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"assert!(!self.feature_enabled);"}]}
        assert!(!self.feature_enabled);
    fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> Diag<'tcx> {
        let mut err = if self.is_function_call {