From dfdfec9efa82a109c749c3ade4854d60e659ee2e Mon Sep 17 00:00:00 2001
From: Vladimir Matveev <vladima@microsoft.com>
Date: Wed, 6 Apr 2016 15:54:50 -0700
Subject: [PATCH] treat classes as block scoped entities

---
 src/compiler/transformers/es6.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 648ad7c8eac..566f6dde846 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -606,6 +606,9 @@ namespace ts {
             //          return C;
             //      }(D))
 
+            if (node.name) {
+                enableSubstitutionsForBlockScopedBindings();
+            }
             const baseTypeNode = getClassExtendsHeritageClauseElement(node);
             const classFunction = createFunctionExpression(
                 /*asteriskToken*/ undefined,