fix(avm): nullifier handling

noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr

@@ -316,6 +316,11 @@ contract AvmTest {
         context.nullifier_exists(nullifier)
     }
 
+    #[aztec(public-vm)]
+    fn assert_nullifier_exists(nullifier: Field) {
+        assert(context.nullifier_exists(nullifier));
+    }
+
     // Use the standard context interface to emit a new nullifier
     #[aztec(public-vm)]
     fn emit_nullifier_and_check(nullifier: Field) {

yarn-project/end-to-end/src/e2e_avm_simulator.test.ts

@@ -1,4 +1,4 @@
-import { AztecAddress, TxStatus, type Wallet } from '@aztec/aztec.js';
+import { AztecAddress, Fr, TxStatus, type Wallet } from '@aztec/aztec.js';
 import { AvmTestContract } from '@aztec/noir-contracts.js';
 
 import { jest } from '@jest/globals';
@@ -51,9 +51,20 @@ describe('e2e_avm_simulator', () => {
   });
 
   describe('Nullifiers', () => {
-    it('Emit and check', async () => {
+    // Nullifier will not yet be siloed by the kernel.
+    it('Emit and check in the same tx', async () => {
       const tx = await avmContact.methods.emit_nullifier_and_check(123456).send().wait();
       expect(tx.status).toEqual(TxStatus.MINED);
     });
+
+    // Nullifier will have been siloed by the kernel, but we check against the unsiloed one.
+    it('Emit and check in separate tx', async () => {
+      const nullifier = new Fr(123456);
+      let tx = await avmContact.methods.new_nullifier(nullifier).send().wait();
+      expect(tx.status).toEqual(TxStatus.MINED);
+
+      tx = await avmContact.methods.assert_nullifier_exists(nullifier).send().wait();
+      expect(tx.status).toEqual(TxStatus.MINED);
+    });
   });
 });

yarn-project/simulator/src/avm/temporary_executor_migration.ts

@@ -7,7 +7,7 @@ import {
   L2ToL1Message,
   type ReadRequest,
   SideEffect,
-  type SideEffectLinkedToNoteHash,
+  SideEffectLinkedToNoteHash,
 } from '@aztec/circuits.js';
 import { Fr } from '@aztec/foundation/fields';
 
@@ -96,7 +96,9 @@ export function temporaryConvertAvmResults(
   const nestedExecutions: PublicExecutionResult[] = [];
   const nullifierReadRequests: ReadRequest[] = [];
   const nullifierNonExistentReadRequests: ReadRequest[] = [];
-  const newNullifiers: SideEffectLinkedToNoteHash[] = [];
+  const newNullifiers: SideEffectLinkedToNoteHash[] = newWorldState.newNullifiers.map(
+    (nullifier, i) => new SideEffectLinkedToNoteHash(nullifier.toField(), Fr.zero(), new Fr(i + 1)),
+  );
   const unencryptedLogs = UnencryptedFunctionL2Logs.empty();
   const newL2ToL1Messages = newWorldState.newL1Messages.map(() => L2ToL1Message.empty());
   // TODO keep track of side effect counters