From 1c64f2cc9e7f11de8b5a17e068358beccefec358 Mon Sep 17 00:00:00 2001
From: Charles Cooper <cooper.charles.m@gmail.com>
Date: Sat, 15 Jul 2023 10:37:25 -0400
Subject: [PATCH] add a sanity check

---
 vyper/codegen/core.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vyper/codegen/core.py b/vyper/codegen/core.py
index 54d773dbd7..5b16938e99 100644
--- a/vyper/codegen/core.py
+++ b/vyper/codegen/core.py
@@ -957,6 +957,7 @@ def _complex_make_setter(left, right):
                 # kind of arbitrary, but cut off when code used > ~160 bytes
                 should_batch_copy = len_ >= 32 * 10
             else:
+                assert _opt_none()
                 # don't care, just generate the most readable version
                 should_batch_copy = True
         else: