tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-elem-iter-thrw-close.js (2265B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-thrw-close.case
      3 // - src/dstr-assignment/error/for-of.template
      4 /*---
      5 description: IteratorClose is called when reference evaluation produces a "throw" completion (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 : [ AssignmentElementList ]
     28 
     29    [...]
     30    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     31       result).
     32    6. Return result.
     33 
     34    7.4.6 IteratorClose( iterator, completion )
     35 
     36    [...]
     37    6. Let innerResult be Call(return, iterator, « »).
     38    [...]
     39 
     40 ---*/
     41 var nextCount = 0;
     42 var returnCount = 0;
     43 var thisValue = null;
     44 var args = null;
     45 var iterable = {};
     46 var iterator = {
     47  next: function() {
     48    nextCount += 1;
     49    return { done: true };
     50  },
     51  return: function() {
     52    returnCount += 1;
     53    thisValue = this;
     54    args = arguments;
     55  }
     56 };
     57 var thrower = function() {
     58  throw new Test262Error();
     59 };
     60 iterable[Symbol.iterator] = function() {
     61  return iterator;
     62 };
     63 
     64 var counter = 0;
     65 
     66 assert.throws(Test262Error, function() {
     67  for ([ {}[thrower()] ] of [iterable]) {
     68    counter += 1;
     69  }
     70  counter += 1;
     71 });
     72 
     73 assert.sameValue(counter, 0);
     74 
     75 assert.sameValue(nextCount, 0);
     76 assert.sameValue(returnCount, 1);
     77 assert.sameValue(thisValue, iterator, 'correct `this` value');
     78 assert(!!args, 'arguments object provided');
     79 assert.sameValue(args.length, 0, 'zero arguments specified');
     80 
     81 reportCompare(0, 0);