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+// 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: >
+ Removal of lexical environment to serve as a temporal dead zone for the
+ statement's AssignmentExpresson
+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.
+ 4. Set the running execution context's LexicalEnvironment to oldEnv.
+ [...]
+features: [let]
+---*/
+
+let x = 'outside';
+var probeDecl, probeExpr, probeBody;
+
+for (
+ let [x, _ = probeDecl = function() { return x; }]
+ of
+ (probeExpr = function() { typeof x; }, [['inside']])
+ )
+ probeBody = function() { return x; };
+
+assert.throws(ReferenceError, probeExpr);
+assert.sameValue(probeDecl(), 'inside', 'reference from ForDeclaration');
+assert.sameValue(probeBody(), 'inside', 'reference from statement body');
+
+reportCompare(0, 0);