tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-elision.js (2301B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elision.case
      3 // - src/dstr-binding/default/gen-func-decl.template
      4 /*---
      5 description: Elision advances iterator (generator function declaration)
      6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [generators, destructuring-binding]
      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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     41 
     42    ArrayBindingPattern : [ Elision ]
     43 
     44    1. Return the result of performing
     45       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     46       as the argument.
     47 
     48    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     49 
     50    Elision : ,
     51 
     52    1. If iteratorRecord.[[done]] is false, then
     53       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     54       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     55       c. ReturnIfAbrupt(next).
     56       d. If next is false, set iteratorRecord.[[done]] to true.
     57    2. Return NormalCompletion(empty).
     58 
     59 ---*/
     60 var first = 0;
     61 var second = 0;
     62 function* g() {
     63  first += 1;
     64  yield;
     65  second += 1;
     66 };
     67 
     68 var callCount = 0;
     69 function* f([,]) {
     70  assert.sameValue(first, 1);
     71  assert.sameValue(second, 0);
     72  callCount = callCount + 1;
     73 };
     74 f(g()).next();
     75 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     76 
     77 reportCompare(0, 0);