fix: special case empty txn_info

trace_decoder/src/imp.rs

@@ -61,15 +61,32 @@ pub fn entrypoint(
         *amt = eth_to_gwei(*amt)
     }
 
-    let batches = middle(
-        state,
-        storage,
-        batch(txn_info, batch_size),
-        &mut code,
-        b_meta.block_timestamp,
-        b_meta.parent_beacon_block_root,
-        withdrawals,
-    )?;
+    // TODO(0xaatif): I hate this
+    let batches = match txn_info.is_empty() {
+        true => {
+            let mut batches = middle(
+                state,
+                storage,
+                vec![vec![TxnInfo::default()]],
+                &mut code,
+                b_meta.block_timestamp,
+                b_meta.parent_beacon_block_root,
+                withdrawals,
+            )?;
+            assert_eq!(batches.len(), 1);
+            batches.push(batches[0].clone());
+            batches
+        }
+        false => middle(
+            state,
+            storage,
+            batch(txn_info, batch_size),
+            &mut code,
+            b_meta.block_timestamp,
+            b_meta.parent_beacon_block_root,
+            withdrawals,
+        )?,
+    };
 
     let mut running_gas_used = 0;
     Ok(batches
@@ -231,7 +248,7 @@ fn test_batch() {
     do_test(3, 3, [1, 2]); // big hint
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct Batch<StateTrieT> {
     pub first_txn_ix: usize,
     pub gas_used: u64,
@@ -249,7 +266,7 @@ struct Batch<StateTrieT> {
 
 /// [`evm_arithmetization::generation::TrieInputs`],
 /// generic over state trie representation.
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct IntraBlockTries<StateTrieT> {
     pub state: StateTrieT,
     pub storage: BTreeMap<H256, StorageTrie>,

trace_decoder/tests/ab.rs

@@ -47,7 +47,6 @@ fn pad1() {
 }
 
 #[test]
-#[should_panic] // TODO(0xaatif): fix
 fn pad2() {
     do_test([(BEACON, acct())], [], [(BEACON, hpt())], [], [], obd());
 }