tor-browser

The Tor Browser
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dflt-ary-ptrn-rest-id-iter-step-err.js (2254B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-id-iter-step-err.case
      3 // - src/dstr-binding/error/func-decl-dflt.template
      4 /*---
      5 description: Error forwarding when IteratorStep returns an abrupt completion (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    BindingRestElement : ... BindingIdentifier
     43    1. Let lhs be ResolveBinding(StringValue of BindingIdentifier,
     44       environment).
     45    2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat,
     46       a. If iteratorRecord.[[done]] is false,
     47          i. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     48          ii. If next is an abrupt completion, set iteratorRecord.[[done]] to
     49              true.
     50          iii. ReturnIfAbrupt(next).
     51 
     52 ---*/
     53 var first = 0;
     54 var second = 0;
     55 var iter = function*() {
     56  first += 1;
     57  throw new Test262Error();
     58  second += 1;
     59 }();
     60 
     61 function f([...x] = iter) {}
     62 
     63 assert.throws(Test262Error, function() {
     64  f();
     65 });
     66 
     67 iter.next();
     68 assert.sameValue(first, 1);
     69 assert.sameValue(second, 0, 'Iterator is closed following abrupt completion.');
     70 
     71 reportCompare(0, 0);