tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-rest-lref.js (2233B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-rest-lref.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: Reference is evaluated during assignment (For..of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [Symbol.iterator, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11      for ( LeftHandSideExpression of AssignmentExpression ) Statement
     12 
     13    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     14       AssignmentExpression, iterate).
     15    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     16       keyResult, assignment, labelSet).
     17 
     18    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     19 
     20    [...]
     21    4. If destructuring is true and if lhsKind is assignment, then
     22       a. Assert: lhs is a LeftHandSideExpression.
     23       b. Let assignmentPattern be the parse of the source text corresponding to
     24          lhs using AssignmentPattern as the goal symbol.
     25    [...]
     26 
     27    ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
     28 
     29    [...]
     30    5. Let result be the result of performing
     31       IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
     32       iteratorRecord as the argument
     33    6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     34       result).
     35 
     36    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
     37 
     38    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
     39       ArrayLiteral, then
     40       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
     41       b. ReturnIfAbrupt(lref).
     42    [...]
     43 
     44 ---*/
     45 var nextCount = 0;
     46 var returnCount = 0;
     47 var iterable = {};
     48 var iterator = {
     49  next: function() {
     50    nextCount += 1;
     51    return { done: true };
     52  },
     53  return: function() {
     54    returnCount += 1;
     55  }
     56 };
     57 var obj = {};
     58 iterable[Symbol.iterator] = function() {
     59  return iterator;
     60 };
     61 
     62 var counter = 0;
     63 
     64 for ([...obj['a' + 'b']] of [iterable]) {
     65  assert.sameValue(nextCount, 1);
     66  assert.sameValue(returnCount, 0);
     67  assert(!!obj.ab);
     68  assert.sameValue(obj.ab.length, 0);
     69  counter += 1;
     70 }
     71 
     72 assert.sameValue(counter, 1);
     73 
     74 reportCompare(0, 0);