tor-browser

The Tor Browser
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array-rest-iter-rtrn-close-null.js (2526B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-rest-iter-rtrn-close-null.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose throws a TypeError when `return` returns a non-Object value (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 : [ 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    7.4.6 IteratorClose( iterator, completion )
     44 
     45    [...]
     46    6. Let innerResult be Call(return, iterator, « »).
     47    [...]
     48 
     49    7.4.6 IteratorClose( iterator, completion )
     50 
     51    [...]
     52    6. Let innerResult be Call(return, iterator, « »).
     53    7. If completion.[[type]] is throw, return Completion(completion).
     54    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     55 
     56 ---*/
     57 var iterable = {};
     58 var iterator = {
     59  return: function() {
     60    return null;
     61  }
     62 };
     63 var iter;
     64 iterable[Symbol.iterator] = function() {
     65  return iterator;
     66 };
     67 
     68 function* g() {
     69 
     70 var counter = 0;
     71 
     72 for ([...{}[yield]] of [iterable]) {
     73  
     74  counter += 1;
     75 }
     76 
     77 assert.sameValue(counter, 1);
     78 
     79 }
     80 
     81 iter = g();
     82 iter.next();
     83 
     84 assert.throws(TypeError, function() {
     85  iter.return();
     86 });
     87 
     88 reportCompare(0, 0);