{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":".then(||"}]}
                    .then(|| TildeConstReason::TraitImpl { span: item.span });
                let disallowed = matches!(constness, Const::No)
                self.with_tilde_const(disallowed, |this| this.visit_generics(generics));