From e523894ed0fa560b4218155b3f8cdc6d2e746e24 Mon Sep 17 00:00:00 2001
From: Fredric Silberberg <frsilb@microsoft.com>
Date: Wed, 24 Jul 2019 11:24:51 -0700
Subject: [PATCH] Only create dictionary when analysis is enabled.

---
 .../CSharp/Portable/Compilation/MemberSemanticModel.cs       | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs b/src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs
index 6a3cab9be79..48adf5b86b3 100644
--- a/src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs
+++ b/src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs
@@ -73,7 +73,10 @@ internal abstract partial class MemberSemanticModel : CSharpSemanticModel
             _speculatedPosition = speculatedPosition;
 
             _operationFactory = new Lazy<CSharpOperationFactory>(() => new CSharpOperationFactory(this));
-            _analyzedVariableTypesOpt = new ConcurrentDictionary<LocalSymbol, LocalSymbol>();
+            if (Compilation.NullableSemanticAnalysisEnabled)
+            {
+                _analyzedVariableTypesOpt = new ConcurrentDictionary<LocalSymbol, LocalSymbol>();
+            }
         }
 
         public override CSharpCompilation Compilation
-- 
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