From e7df8538eb8f0ed06f0838d946bec8e9e0fe0985 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 1 Dec 2022 18:55:43 -0800
Subject: Allow `no_diff` on `this` parameter. (#2543)

---
 source/slang/slang-ast-builder.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'source/slang/slang-ast-builder.cpp')

diff --git a/source/slang/slang-ast-builder.cpp b/source/slang/slang-ast-builder.cpp
index 623a9161b..ab161065d 100644
--- a/source/slang/slang-ast-builder.cpp
+++ b/source/slang/slang-ast-builder.cpp
@@ -141,6 +141,16 @@ Type* SharedASTBuilder::getNoneType()
     return m_noneType;
 }
 
+Type* SharedASTBuilder::getDiffInterfaceType()
+{
+    if (!m_diffInterfaceType)
+    {
+        auto decl = findMagicDecl("DifferentiableType");
+        m_diffInterfaceType = DeclRefType::create(m_astBuilder, makeDeclRef<Decl>(decl));
+    }
+    return m_diffInterfaceType;
+}
+
 SharedASTBuilder::~SharedASTBuilder()
 {
     // Release built in types..
-- 
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