{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"crate::ConstScalar::UnevaluatedConst(id,"}]}
                crate::ConstScalar::UnevaluatedConst(id, subst) => {
                // try to evaluate unevaluated const. Replace with new var if const eval failed.
                    if let Ok(eval) = self.db.const_eval(*id, subst.clone(), None) {