From 1c5da67cd8fa67ff45f3d48a1bdb0f08a606f6ed Mon Sep 17 00:00:00 2001
From: Tom Hvitved <hvitved@github.com>
Date: Wed, 27 May 2020 15:26:03 +0200
Subject: [PATCH] C#: Fix performance issue in unification library

---
 csharp/ql/src/semmle/code/csharp/Unification.qll | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/csharp/ql/src/semmle/code/csharp/Unification.qll b/csharp/ql/src/semmle/code/csharp/Unification.qll
index 77aeae0813a4..48256a59a29c 100644
--- a/csharp/ql/src/semmle/code/csharp/Unification.qll
+++ b/csharp/ql/src/semmle/code/csharp/Unification.qll
@@ -474,7 +474,8 @@ module Gvn {
         sourceDecl = any(GenericType t).getSourceDeclaration() and
         not sourceDecl instanceof PointerType and
         not sourceDecl instanceof NullableType and
-        not sourceDecl instanceof ArrayType
+        not sourceDecl instanceof ArrayType and
+        not sourceDecl instanceof TupleType
       }
 
     cached