tor-browser

The Tor Browser
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array-elem-iter-rtrn-close-err.js (2178B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-rtrn-close-err.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose is called when reference evaluation produces a "return" completion (For..of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [Symbol.iterator, generators, 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    7. If completion.[[type]] is throw, return Completion(completion).
     39    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     40 
     41 ---*/
     42 var returnCount = 0;
     43 var unreachable = 0;
     44 var iterable = {};
     45 var iterator = {
     46  return: function() {
     47    returnCount += 1;
     48    throw new Test262Error();
     49  }
     50 };
     51 var iter;
     52 iterable[Symbol.iterator] = function() {
     53  return iterator;
     54 };
     55 
     56 function* g() {
     57 
     58 var counter = 0;
     59 
     60 for ([ {}[ yield ] ] of [iterable]) {
     61  unreachable += 1;
     62  counter += 1;
     63 }
     64 
     65 assert.sameValue(counter, 1);
     66 
     67 }
     68 iter = g();
     69 iter.next();
     70 assert.throws(Test262Error, function() {
     71  iter.return();
     72 });
     73 
     74 assert.sameValue(returnCount, 1);
     75 assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
     76 
     77 reportCompare(0, 0);