From adf7e039cb95f410366e2ab97f06f1131db07333 Mon Sep 17 00:00:00 2001
From: Alexander Karzhenkov <karzhenkov@mail.ru>
Date: Sun, 8 Jan 2023 11:55:28 +0500
Subject: [PATCH] Fix warning about constness

---
 tests/src/unit-conversions.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/src/unit-conversions.cpp b/tests/src/unit-conversions.cpp
index 72ef03de2..bb7209b9c 100644
--- a/tests/src/unit-conversions.cpp
+++ b/tests/src/unit-conversions.cpp
@@ -1584,7 +1584,7 @@ TEST_CASE("std::optional")
     SECTION("null")
     {
         json j_null;
-        std::optional<std::string> opt_null;
+        std::optional<std::string> const opt_null;
 
         CHECK(json(opt_null) == j_null);
         CHECK(j_null.get<std::optional<std::string>>() == std::nullopt);