1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-in/scope-head-var-none.js b/js/src/tests/test262/language/statements/for-in/scope-head-var-none.js
new file mode 100644
index 0000000000..d0536483b3
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+++ b/js/src/tests/test262/language/statements/for-in/scope-head-var-none.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+description: >
+    No variable environment is created for the statement "head"
+info: |
+    IterationStatement : for ( ForDeclaration of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ?
+       ForIn/OfHeadEvaluation(BoundNames of ForDeclaration,
+       AssignmentExpression, iterate).
+    [...]
+
+    13.7.5.12 Runtime Semantics: ForIn/OfHeadEvaluation
+
+    [...]
+    2. If TDZnames is not an empty List, then
+       a. Assert: TDZnames has no duplicate entries.
+       b. Let TDZ be NewDeclarativeEnvironment(oldEnv).
+       c. Let TDZEnvRec be TDZ's EnvironmentRecord.
+       d. For each string name in TDZnames, do
+          i. Perform ! TDZEnvRec.CreateMutableBinding(name, false).
+       e. Set the running execution context's LexicalEnvironment to TDZ.
+    3. Let exprRef be the result of evaluating expr.
+    [...]
+flags: [noStrict]
+---*/
+
+var probeBefore = function() { return x; };
+var x = 1;
+var probeDecl, probeExpr, probeBody;
+
+for (
+    let [_ = probeDecl = function() { return x; }]
+    in
+    { '': (eval('var x = 2;'), probeExpr = function() { return x; }) }
+  )
+  probeBody = function() { return x; };
+
+assert.sameValue(probeBefore(), 2, 'reference preceding statement');
+assert.sameValue(probeDecl(), 2, 'reference from ForDeclaration');
+assert.sameValue(probeExpr(), 2, 'reference from AssignmentExpression');
+assert.sameValue(probeBody(), 2, 'reference from statement body');
+assert.sameValue(x, 2, 'reference following statement');
+
+reportCompare(0, 0);