From 5c85818f509c917c1d7a6a6e1dcb47b54060545f Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Wed, 30 Nov 2022 10:06:44 +0100
Subject: [PATCH] Update libyul/optimiser/KnowledgeBase.cpp

Co-authored-by: matheusaaguiar <95899911+matheusaaguiar@users.noreply.github.com>
---
 libyul/optimiser/KnowledgeBase.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libyul/optimiser/KnowledgeBase.cpp b/libyul/optimiser/KnowledgeBase.cpp
index 00d7cda1c..36f07b74a 100644
--- a/libyul/optimiser/KnowledgeBase.cpp
+++ b/libyul/optimiser/KnowledgeBase.cpp
@@ -52,7 +52,7 @@ optional<u256> KnowledgeBase::differenceIfKnownConstant(YulString _a, YulString
 	if (offA.reference == offB.reference)
 		return offA.offset - offB.offset;
 	else
-		return {};
+		return nullopt;
 }