head-lhs-let.js (937B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-iteration-statements 5 es6id: 13.7 6 description: > 7 The `let` token is interpreted as an Identifier when it is not followed by a 8 `[` token 9 info: | 10 Syntax 11 12 IterationStatement[Yield, Return]: 13 14 for ( [lookahead ∉ { let [ } ] LeftHandSideExpression[?Yield] in 15 Expression[+In, ?Yield] ) Statement[?Yield, ?Return] 16 17 for ( ForDeclaration[?Yield] in Expression[+In, ?Yield] ) 18 Statement[?Yield, ?Return] 19 flags: [noStrict] 20 ---*/ 21 22 var obj = Object.create(null); 23 var let, value; 24 25 obj.key = 1; 26 27 for ( let in obj ) ; 28 29 assert.sameValue(let, 'key', 'IdentifierReference'); 30 31 Object.defineProperty(Array.prototype, '1', { 32 set: function(param) { 33 value = param; 34 } 35 }); 36 for ( [let][1] in obj ) ; 37 38 assert.sameValue(value, 'key', 'MemberExpression'); 39 40 reportCompare(0, 0);