tor-browser

The Tor Browser
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dflt-ary-ptrn-rest-ary-elision.js (2723B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-ary-elision.case
      3 // - src/dstr-binding/default/func-decl-dflt.template
      4 /*---
      5 description: Rest element containing an elision (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    BindingRestElement : ... BindingPattern
     44 
     45    1. Let A be ArrayCreate(0).
     46    [...]
     47    3. Repeat
     48       [...]
     49       b. If iteratorRecord.[[done]] is true, then
     50          i. Return the result of performing BindingInitialization of
     51             BindingPattern with A and environment as the arguments.
     52       [...]
     53 
     54    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     55 
     56    ArrayBindingPattern : [ Elision ]
     57 
     58    1. Return the result of performing
     59       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     60       as the argument.
     61 
     62    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     63 
     64    Elision : ,
     65 
     66    1. If iteratorRecord.[[done]] is false, then
     67       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     68       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     69       c. ReturnIfAbrupt(next).
     70       d. If next is false, set iteratorRecord.[[done]] to true.
     71    2. Return NormalCompletion(empty).
     72 
     73 ---*/
     74 var first = 0;
     75 var second = 0;
     76 function* g() {
     77  first += 1;
     78  yield;
     79  second += 1;
     80 };
     81 
     82 var callCount = 0;
     83 function f([...[,]] = g()) {
     84  assert.sameValue(first, 1);
     85  assert.sameValue(second, 1);
     86  callCount = callCount + 1;
     87 };
     88 f();
     89 assert.sameValue(callCount, 1, 'function invoked exactly once');
     90 
     91 reportCompare(0, 0);