{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"*self.expressions_memo.entry(new_expr.clone()).or_insert_with(||"}]}
        *self.expressions_memo.entry(new_expr.clone()).or_insert_with(|| {
        let new_expr = Expression { lhs, op, rhs };
            let id = self.expressions.push(new_expr);