From 8196dc4a684a75344e507697273e2123af97b979 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Sun, 21 Jan 2018 16:26:52 -0800
Subject: specialize witness tables when needed when specializing
 `lookup_witness_table` instruction. (#376)

---
 source/slang/syntax.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'source/slang/syntax.cpp')

diff --git a/source/slang/syntax.cpp b/source/slang/syntax.cpp
index ab4a5f94c..3bccf51ce 100644
--- a/source/slang/syntax.cpp
+++ b/source/slang/syntax.cpp
@@ -856,7 +856,12 @@ void Type::accept(IValVisitor* visitor, void* extra)
 
     Type* ErrorType::CreateCanonicalType()
     {
-        return  this;
+        return this;
+    }
+
+    RefPtr<Val> ErrorType::SubstituteImpl(SubstitutionSet /*subst*/, int* /*ioDiff*/)
+    {
+        return this;
     }
 
     int ErrorType::GetHashCode()
-- 
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