From 1d7688aef2e7b6f9d11644702f8ce7533aa1fb20 Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Mon, 18 May 2026 22:34:13 +0200
Subject: [PATCH] optional: use #if instead of #ifndef in test, fixes #3859
 (#5183)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---
 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 4581fa660..7542ef630 100644
--- a/tests/src/unit-conversions.cpp
+++ b/tests/src/unit-conversions.cpp
@@ -1761,7 +1761,7 @@ TEST_CASE("std::filesystem::path")
 }
 #endif
 
-#ifndef JSON_USE_IMPLICIT_CONVERSIONS
+#if !JSON_USE_IMPLICIT_CONVERSIONS
 TEST_CASE("std::optional")
 {
     SECTION("null")