Address comment.

Author: LeilaWang

noir-projects/noir-protocol-circuits/crates/rollup-lib/src/root/utils/compute_epoch_out_hash.nr

@@ -25,6 +25,10 @@ use types::{
 /// By using a fixed unbalanced tree structure, the positions (leaf ids) of existing checkpoints remain stable even as
 /// more checkpoints are appended.
 pub fn compute_epoch_out_hash(out_hashes: [Field; AZTEC_MAX_EPOCH_DURATION]) -> Field {
+    std::static_assert(
+        AZTEC_MAX_EPOCH_DURATION == 48,
+        "Remember to update these constants of 32 and 16",
+    );
     let left_subtree_out_hashes: [Field; 32] = subarray(out_hashes, 0);
     let right_subtree_out_hashes: [Field; 16] = subarray(out_hashes, 32);
     let left_subtree_root = MerkleTree::new_sha(left_subtree_out_hashes).get_root();
@@ -47,9 +51,6 @@ mod tests {
 
     #[test]
     fn full_epoch_matches_ts() {
-        // If the constant's changed, update `compute_epoch_out_hash` to work with the new tree size.
-        assert_eq(AZTEC_MAX_EPOCH_DURATION, 48);
-
         let mut out_hashes = [0; AZTEC_MAX_EPOCH_DURATION];
         for i in 0..AZTEC_MAX_EPOCH_DURATION {
             out_hashes[i] = 123 + i as Field;