tor-browser

The Tor Browser
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array-elem-iter-rtrn-close-null.js (2067B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-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 : [ AssignmentElementList ]
     19 
     20    [...]
     21    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     22       result).
     23    6. Return result.
     24 
     25    7.4.6 IteratorClose( iterator, completion )
     26 
     27    [...]
     28    6. Let innerResult be Call(return, iterator, « »).
     29    7. If completion.[[type]] is throw, return Completion(completion).
     30    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     31    9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
     32       exception.
     33 
     34 ---*/
     35 var nextCount = 0;
     36 var returnCount = 0;
     37 var unreachable = 0;
     38 var iterator = {
     39  next: function() {
     40    nextCount += 1;
     41    return {done: false, value: undefined};
     42  },
     43  return: function() {
     44    returnCount += 1;
     45    return null;
     46  }
     47 };
     48 var iterable = {};
     49 iterable[Symbol.iterator] = function() {
     50  return iterator;
     51 };
     52 function* g() {
     53 
     54 var result;
     55 var vals = iterable;
     56 
     57 result = [ {} = yield ] = vals;
     58 
     59 unreachable += 1;
     60 
     61 assert.sameValue(result, vals);
     62 
     63 }
     64 
     65 var iter = g();
     66 iter.next();
     67 
     68 assert.sameValue(nextCount, 1);
     69 assert.sameValue(returnCount, 0);
     70 assert.throws(TypeError, function() {
     71  iter.return();
     72 });
     73 assert.sameValue(nextCount, 1);
     74 assert.sameValue(returnCount, 1);
     75 assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
     76 
     77 reportCompare(0, 0);