scope-body-lex-open.js (1662B)
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-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 5 description: > 6 Creation of new lexical environment for the initial evaluation of the 7 statement body 8 info: | 9 IterationStatement : for ( ForDeclaration of AssignmentExpression ) Statement 10 11 [...] 12 2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, 13 lexicalBinding, labelSet). 14 15 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 16 17 [...] 18 5. Repeat 19 [...] 20 d. If lhsKind is either assignment or varBinding, then 21 [...] 22 e. Else, 23 i. Assert: lhsKind is lexicalBinding. 24 ii. Assert: lhs is a ForDeclaration. 25 iii. Let iterationEnv be NewDeclarativeEnvironment(oldEnv). 26 iv. Perform BindingInstantiation for lhs passing iterationEnv as the 27 argument. 28 v. Set the running execution context's LexicalEnvironment to 29 iterationEnv. 30 [...] 31 features: [let] 32 ---*/ 33 34 var probeBefore = function() { return x; }; 35 let x = 'outside'; 36 var probeExpr, probeDecl, probeBody; 37 38 for ( 39 let [x, _, __ = probeDecl = function() { return x; }] 40 of 41 [['inside', probeExpr = function() { typeof x; }]] 42 ) 43 probeBody = function() { return x; }; 44 45 assert.sameValue(probeBefore(), 'outside'); 46 assert.throws(ReferenceError, probeExpr); 47 assert.sameValue(probeDecl(), 'inside', 'reference from ForDeclaration'); 48 assert.sameValue(probeBody(), 'inside', 'reference from statement body'); 49 50 reportCompare(0, 0);