tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-init-iter-close.js (1972B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-init-iter-close.case
      3 // - src/dstr-binding/default/arrow-function-dflt.template
      4 /*---
      5 description: Iterator is closed when not exhausted by pattern evaluation (arrow function expression (default parameter))
      6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation
      7 features: [Symbol.iterator, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    ArrowFunction : ArrowParameters => ConciseBody
     11 
     12    [...]
     13    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
     14    [...]
     15 
     16    9.2.1 [[Call]] ( thisArgument, argumentsList)
     17 
     18    [...]
     19    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     20    [...]
     21 
     22    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     23 
     24    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     25    [...]
     26 
     27    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     28 
     29    [...]
     30    23. Let iteratorRecord be Record {[[iterator]]:
     31        CreateListIterator(argumentsList), [[done]]: false}.
     32    24. If hasDuplicates is true, then
     33        [...]
     34    25. Else,
     35        b. Let formalStatus be IteratorBindingInitialization for formals with
     36           iteratorRecord and env as arguments.
     37    [...]
     38 
     39    13.3.3.5 Runtime Semantics: BindingInitialization
     40 
     41    BindingPattern : ArrayBindingPattern
     42 
     43    [...]
     44    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
     45       result).
     46    [...]
     47 
     48 ---*/
     49 var doneCallCount = 0;
     50 var iter = {};
     51 iter[Symbol.iterator] = function() {
     52  return {
     53    next: function() {
     54      return { value: null, done: false };
     55    },
     56    return: function() {
     57      doneCallCount += 1;
     58      return {};
     59    }
     60  };
     61 };
     62 
     63 var callCount = 0;
     64 var f;
     65 f = ([x] = iter) => {
     66  assert.sameValue(doneCallCount, 1);
     67  callCount = callCount + 1;
     68 };
     69 
     70 f();
     71 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     72 
     73 reportCompare(0, 0);