tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-elision-exhausted.js (2006B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elision-exhausted.case
      3 // - src/dstr-binding/default/func-decl-dflt.template
      4 /*---
      5 description: Elision accepts exhausted iterator (function declaration (default parameter))
      6 esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    FunctionDeclaration :
     11        function BindingIdentifier ( FormalParameters ) { FunctionBody }
     12 
     13        [...]
     14        3. Let F be FunctionCreate(Normal, FormalParameters, FunctionBody,
     15           scope, strict).
     16        [...]
     17 
     18    9.2.1 [[Call]] ( thisArgument, argumentsList)
     19 
     20    [...]
     21    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     22    [...]
     23 
     24    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     25 
     26    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     27    [...]
     28 
     29    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     30 
     31    [...]
     32    23. Let iteratorRecord be Record {[[iterator]]:
     33        CreateListIterator(argumentsList), [[done]]: false}.
     34    24. If hasDuplicates is true, then
     35        [...]
     36    25. Else,
     37        b. Let formalStatus be IteratorBindingInitialization for formals with
     38           iteratorRecord and env as arguments.
     39    [...]
     40 
     41    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     42 
     43    ArrayBindingPattern : [ Elision ]
     44 
     45    1. Return the result of performing
     46       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     47       as the argument.
     48 
     49    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     50 
     51    Elision : ,
     52 
     53    1. If iteratorRecord.[[done]] is false, then
     54       [...]
     55    2. Return NormalCompletion(empty).
     56 
     57 ---*/
     58 var iter = function*() {}();
     59 iter.next();
     60 
     61 var callCount = 0;
     62 function f([,] = iter) {
     63  
     64  callCount = callCount + 1;
     65 };
     66 f();
     67 assert.sameValue(callCount, 1, 'function invoked exactly once');
     68 
     69 reportCompare(0, 0);