From d6fcd1af1ba424eb163a0da153b4c296de825f7c Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 4 Mar 2016 13:19:58 -0800
Subject: [PATCH] Consider for-in and for-of variables to be definitely
 assigned

---
 src/compiler/checker.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 1e693867baf..491e1fe0ee1 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -7525,6 +7525,10 @@ namespace ts {
             if (!declaration || declaration.kind !== SyntaxKind.VariableDeclaration || (<VariableDeclaration>declaration).initializer) {
                 return;
             }
+            const parentParentKind = declaration.parent.parent.kind;
+            if (parentParentKind === SyntaxKind.ForOfStatement || parentParentKind === SyntaxKind.ForInStatement) {
+                return;
+            }
             const declarationContainer = getContainingFunction(declaration) || getSourceFileOfNode(declaration);
             const referenceContainer = getContainingFunction(reference) || getSourceFileOfNode(reference);
             if (declarationContainer !== referenceContainer) {