tor-browser

The Tor Browser
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let-ary-ptrn-rest-id-iter-step-err.js (2216B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-id-iter-step-err.case
      3 // - src/dstr-binding/error/for-let.template
      4 /*---
      5 description: Error forwarding when IteratorStep returns an abrupt completion (for statement)
      6 esid: sec-for-statement-runtime-semantics-labelledevaluation
      7 features: [generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( LexicalDeclaration Expressionopt ; Expressionopt ) Statement
     12 
     13    [...]
     14    7. Let forDcl be the result of evaluating LexicalDeclaration.
     15    [...]
     16 
     17    LexicalDeclaration : LetOrConst BindingList ;
     18 
     19    1. Let next be the result of evaluating BindingList.
     20    2. ReturnIfAbrupt(next).
     21    3. Return NormalCompletion(empty).
     22 
     23    BindingList : BindingList , LexicalBinding
     24 
     25    1. Let next be the result of evaluating BindingList.
     26    2. ReturnIfAbrupt(next).
     27    3. Return the result of evaluating LexicalBinding.
     28 
     29    LexicalBinding : BindingPattern Initializer
     30 
     31    1. Let rhs be the result of evaluating Initializer.
     32    2. Let value be GetValue(rhs).
     33    3. ReturnIfAbrupt(value).
     34    4. Let env be the running execution context’s LexicalEnvironment.
     35    5. Return the result of performing BindingInitialization for BindingPattern
     36       using value and env as the arguments.
     37 
     38    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     39    BindingRestElement : ... BindingIdentifier
     40    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
     41       environment).
     42    2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat,
     43       a. If iteratorRecord.[[done]] is false,
     44          i. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     45          ii. If next is an abrupt completion, set iteratorRecord.[[done]] to
     46              true.
     47          iii. ReturnIfAbrupt(next).
     48 
     49 ---*/
     50 var first = 0;
     51 var second = 0;
     52 var iter = function*() {
     53  first += 1;
     54  throw new Test262Error();
     55  second += 1;
     56 }();
     57 
     58 assert.throws(Test262Error, function() {
     59  for (let [...x] = iter; ; ) {
     60    return;
     61  }
     62 });
     63 
     64 iter.next();
     65 assert.sameValue(first, 1);
     66 assert.sameValue(second, 0, 'Iterator is closed following abrupt completion.');
     67 
     68 reportCompare(0, 0);