From 8f36bb8cf31cc85aeaf8934ac7cd752f517bf033 Mon Sep 17 00:00:00 2001
From: Ziyang Hu <hu.ziyang@cantab.net>
Date: Mon, 30 Oct 2023 22:16:20 +0800
Subject: [PATCH] make `eval_to_const` public
 https://github.com/cozodb/cozo/issues/162

---
 cozo-core/src/data/expr.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cozo-core/src/data/expr.rs b/cozo-core/src/data/expr.rs
index a8d25eac..26ab25bb 100644
--- a/cozo-core/src/data/expr.rs
+++ b/cozo-core/src/data/expr.rs
@@ -396,7 +396,8 @@ impl Expr {
         }
         Ok(())
     }
-    pub(crate) fn eval_to_const(mut self) -> Result<DataValue> {
+    /// Evaluate the expression to a constant value if possible
+    pub fn eval_to_const(mut self) -> Result<DataValue> {
         #[derive(Error, Diagnostic, Debug)]
         #[error("Expression contains unevaluated constant")]
         #[diagnostic(code(eval::not_constant))]