tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-elem-trlg-iter-rest-rtrn-close-null.js (2123B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-trlg-iter-rest-rtrn-close-null.case
      3 // - src/dstr-assignment/default/assignment-expr.template
      4 /*---
      5 description: IteratorClose throws a TypeError when `return` returns a non-Object value (AssignmentExpression)
      6 esid: sec-variable-statement-runtime-semantics-evaluation
      7 features: [Symbol.iterator, generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    VariableDeclaration : BindingPattern Initializer
     11 
     12    1. Let rhs be the result of evaluating Initializer.
     13    2. Let rval be GetValue(rhs).
     14    3. ReturnIfAbrupt(rval).
     15    4. Return the result of performing BindingInitialization for
     16       BindingPattern passing rval and undefined as arguments.
     17 
     18    ArrayAssignmentPattern :
     19        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
     20 
     21    [...]
     22    7. If AssignmentRestElement is present, then
     23       a. Let status be the result of performing
     24          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
     25          with iteratorRecord as the argument.
     26    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     27       status).
     28    9. Return Completion(status).
     29 
     30    7.4.6 IteratorClose( iterator, completion )
     31 
     32    [...]
     33    6. Let innerResult be Call(return, iterator, « »).
     34    7. If completion.[[type]] is throw, return Completion(completion).
     35    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     36 
     37 ---*/
     38 var nextCount = 0;
     39 var iterable = {};
     40 var x;
     41 var iterator = {
     42  next: function() {
     43    nextCount += 1;
     44    // Set an upper-bound to limit unnecessary iteration in non-conformant
     45    // implementations
     46    return { done: nextCount > 10 };
     47  },
     48  return: function() {
     49    return null;
     50  }
     51 };
     52 var iter;
     53 iterable[Symbol.iterator] = function() {
     54  return iterator;
     55 };
     56 
     57 function* g() {
     58 
     59 var result;
     60 var vals = iterable;
     61 
     62 result = [ x , ...{}[yield] ] = vals;
     63 
     64 
     65 
     66 assert.sameValue(result, vals);
     67 
     68 }
     69 
     70 iter = g();
     71 iter.next();
     72 
     73 assert.throws(TypeError, function() {
     74  iter.return();
     75 });
     76 
     77 assert.sameValue(nextCount, 1);
     78 
     79 reportCompare(0, 0);