tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-elem-trlg-iter-list-rtrn-close-null.js (2324B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-trlg-iter-list-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    3. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
     23    4. Let status be the result of performing
     24       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
     25       iteratorRecord as the argument.
     26    5. If status is an abrupt completion, then
     27       a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     28          status).
     29       b. Return Completion(status).
     30 
     31    7.4.6 IteratorClose( iterator, completion )
     32 
     33    [...]
     34    6. Let innerResult be Call(return, iterator, « »).
     35    7. If completion.[[type]] is throw, return Completion(completion).
     36    8. If innerResult.[[type]] is throw, return Completion(innerResult).
     37    9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
     38       exception.
     39 
     40 ---*/
     41 var nextCount = 0;
     42 var returnCount = 0;
     43 var iterator = {
     44  next: function() {
     45    nextCount += 1;
     46    return {done: false, value: undefined};
     47  },
     48  return: function() {
     49    returnCount += 1;
     50    return null;
     51  }
     52 };
     53 var iterable = {};
     54 iterable[Symbol.iterator] = function() {
     55  return iterator;
     56 };
     57 
     58 function* g() {
     59 
     60 var result;
     61 var vals = iterable;
     62 
     63 result = [ {} = yield , ] = vals;
     64 
     65 
     66 
     67 assert.sameValue(result, vals);
     68 
     69 }
     70 
     71 var iter = g();
     72 iter.next();
     73 
     74 assert.sameValue(nextCount, 1);
     75 assert.sameValue(returnCount, 0);
     76 assert.throws(TypeError, function() {
     77  iter.return();
     78 });
     79 assert.sameValue(nextCount, 1);
     80 assert.sameValue(returnCount, 1);
     81 
     82 reportCompare(0, 0);