JSTests/test262/test/language/statements/class/dstr/meth-dflt-ary-init-iter-no-close.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-init-iter-no-close.case
// - src/dstr-binding/default/cls-decl-meth-dflt.template
/*---
description: Iterator is not closed when exhausted by pattern evaluation (class expression method (default parameter))
esid: sec-runtime-semantics-bindingclassdeclarationevaluation
features: [Symbol.iterator, destructuring-binding, default-parameters]
flags: [generated]
info: |
    ClassDeclaration : class BindingIdentifier ClassTail

    1. Let className be StringValue of BindingIdentifier.
    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
       argument className.
    [...]

    14.5.14 Runtime Semantics: ClassDefinitionEvaluation

    21. For each ClassElement m in order from methods
        a. If IsStatic of m is false, then
           i. Let status be the result of performing
              PropertyDefinitionEvaluation for m with arguments proto and
              false.
        [...]

    14.3.8 Runtime Semantics: DefineMethod

    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }

    [...]
    6. Let closure be FunctionCreate(kind, StrictFormalParameters, FunctionBody,
       scope, strict). If functionPrototype was passed as a parameter then pass its
       value as the functionPrototype optional argument of FunctionCreate.
    [...]

    9.2.1 [[Call]] ( thisArgument, argumentsList)

    [...]
    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
    [...]

    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )

    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
    [...]

    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)

    [...]
    23. Let iteratorRecord be Record {[[iterator]]:
        CreateListIterator(argumentsList), [[done]]: false}.
    24. If hasDuplicates is true, then
        [...]
    25. Else,
        b. Let formalStatus be IteratorBindingInitialization for formals with
           iteratorRecord and env as arguments.
    [...]

    13.3.3.5 Runtime Semantics: BindingInitialization

    BindingPattern : ArrayBindingPattern

    [...]
    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
       result).
    [...]

---*/
var doneCallCount = 0;
var iter = {};
iter[Symbol.iterator] = function() {
  return {
    next: function() {
      return { value: null, done: true };
    },
    return: function() {
      doneCallCount += 1;
      return {};
    }
  };
};

var callCount = 0;
class C {
  method([x] = iter) {
    assert.sameValue(doneCallCount, 0);
    callCount = callCount + 1;
  }
};

new C().method();
assert.sameValue(callCount, 1, 'method invoked exactly once');