tor-browser

The Tor Browser
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let-ary-ptrn-rest-id-iter-step-err.js (2182B)

      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-of-let.template
      4 /*---
      5 description: Error forwarding when IteratorStep returns an abrupt completion (for-of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( ForDeclaration of AssignmentExpression ) Statement
     12 
     13    [...]
     14    3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     15       lexicalBinding, labelSet).
     16 
     17    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     18 
     19    [...]
     20    3. Let destructuring be IsDestructuring of lhs.
     21    [...]
     22    5. Repeat
     23       [...]
     24       h. If destructuring is false, then
     25          [...]
     26       i. Else
     27          i. If lhsKind is assignment, then
     28             [...]
     29          ii. Else if lhsKind is varBinding, then
     30              [...]
     31          iii. Else,
     32               1. Assert: lhsKind is lexicalBinding.
     33               2. Assert: lhs is a ForDeclaration.
     34               3. Let status be the result of performing BindingInitialization
     35                  for lhs passing nextValue and iterationEnv as arguments.
     36          [...]
     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] of [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);