From 09684224d5ab63f530d66c0be65fa50e6fc5290b Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 30 Nov 2022 13:24:39 -0800
Subject: Support `no_diff` on existential typed params. (#2540)

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-check-conformance.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'source/slang/slang-check-conformance.cpp')

diff --git a/source/slang/slang-check-conformance.cpp b/source/slang/slang-check-conformance.cpp
index d2335efbf..4d983b746 100644
--- a/source/slang/slang-check-conformance.cpp
+++ b/source/slang/slang-check-conformance.cpp
@@ -87,8 +87,10 @@ namespace Slang
             // that `subType` has been proven to be *equal*
             // to `superTypeDeclRef`.
             //
-            SLANG_UNEXPECTED("reflexive type witness");
-            UNREACHABLE_RETURN(nullptr);
+            auto witness = m_astBuilder->create<TypeEqualityWitness>();
+            witness->sub = subType;
+            witness->sup = subType;
+            return witness;
         }
 
         // We might have one or more steps in the breadcrumb trail, e.g.:
-- 
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