{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"self.psess.gated_spans.gate(sym::negative_bounds,"}]}
            self.psess.gated_spans.gate(sym::negative_bounds, self.prev_token.span);
        } else if self.eat(exp!(Bang)) {
            BoundPolarity::Negative(self.prev_token.span)