tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-init-iter-no-close.js (2077B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-init-iter-no-close.case
      3 // - src/dstr-binding/default/gen-func-decl-dflt.template
      4 /*---
      5 description: Iterator is not closed when exhausted by pattern evaluation (generator function declaration (default parameter))
      6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [Symbol.iterator, generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
     11 
     12        [...]
     13        2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
     14           GeneratorBody, scope, strict).
     15        [...]
     16 
     17    9.2.1 [[Call]] ( thisArgument, argumentsList)
     18 
     19    [...]
     20    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     21    [...]
     22 
     23    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     24 
     25    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     26    [...]
     27 
     28    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     29 
     30    [...]
     31    23. Let iteratorRecord be Record {[[iterator]]:
     32        CreateListIterator(argumentsList), [[done]]: false}.
     33    24. If hasDuplicates is true, then
     34        [...]
     35    25. Else,
     36        b. Let formalStatus be IteratorBindingInitialization for formals with
     37           iteratorRecord and env as arguments.
     38    [...]
     39 
     40    13.3.3.5 Runtime Semantics: BindingInitialization
     41 
     42    BindingPattern : ArrayBindingPattern
     43 
     44    [...]
     45    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
     46       result).
     47    [...]
     48 
     49 ---*/
     50 var doneCallCount = 0;
     51 var iter = {};
     52 iter[Symbol.iterator] = function() {
     53  return {
     54    next: function() {
     55      return { value: null, done: true };
     56    },
     57    return: function() {
     58      doneCallCount += 1;
     59      return {};
     60    }
     61  };
     62 };
     63 
     64 var callCount = 0;
     65 function* f([x] = iter) {
     66  assert.sameValue(doneCallCount, 0);
     67  callCount = callCount + 1;
     68 };
     69 f().next();
     70 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     71 
     72 reportCompare(0, 0);