tor-browser

The Tor Browser
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array-elem-iter-thrw-close-err.js (1984B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-thrw-close-err.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 ---*/
     35 var nextCount = 0;
     36 var returnCount = 0;
     37 function ReturnError() {}
     38 var iterable = {};
     39 var iterator = {
     40  next: function() {
     41    nextCount += 1;
     42    return { done: true };
     43  },
     44  return: function() {
     45    returnCount += 1;
     46 
     47    // This value should be discarded.
     48    throw new ReturnError();
     49  }
     50 };
     51 var thrower = function() {
     52  throw new Test262Error();
     53 };
     54 iterable[Symbol.iterator] = function() {
     55  return iterator;
     56 };
     57 
     58 var counter = 0;
     59 
     60 assert.throws(Test262Error, function() {
     61  for ([ {}[thrower()] ] of [iterable]) {
     62    counter += 1;
     63  }
     64  counter += 1;
     65 });
     66 
     67 assert.sameValue(counter, 0);
     68 
     69 assert.sameValue(nextCount, 0);
     70 assert.sameValue(returnCount, 1);
     71 
     72 reportCompare(0, 0);