From 5e1974e8cad3396a8c4bedfd63c1ad31b82ec8eb Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 30 May 2023 10:41:34 -0700
Subject: Fix derivative signature bug in checkDerivativeAttribute. (#2905)

---
 source/slang/slang-check-decl.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'source')

diff --git a/source/slang/slang-check-decl.cpp b/source/slang/slang-check-decl.cpp
index c7a955f06..4e2f146a1 100644
--- a/source/slang/slang-check-decl.cpp
+++ b/source/slang/slang-check-decl.cpp
@@ -7027,7 +7027,8 @@ namespace Slang
         List<Expr*> imaginaryArguments;
         auto isOutParam = [&](ParamDecl* param)
         {
-            return param->findModifier<OutModifier>() != nullptr && param->findModifier<InModifier>() == nullptr;
+            return param->findModifier<OutModifier>() != nullptr
+                && param->findModifier<InModifier>() == nullptr && param->findModifier<InOutModifier>() == nullptr;
         };
 
         for (auto param : originalFuncDecl->getParameters())
-- 
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