text: // This file was procedurally generated from the following sources:
  // - src/dstr-binding/obj-ptrn-prop-obj-init.case
  // - src/dstr-binding/default/gen-func-decl.template
  /*---
  description: Object binding pattern with "nested" object binding pattern using initializer (generator function declaration)
  esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
  es6id: 14.4.12
  features: [destructuring-binding]
  flags: [generated]
  info: |
      GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
  
          [...]
          2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
             GeneratorBody, scope, strict).
          [...]
  
      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.
      [...]
  
      13.3.3.7 Runtime Semantics: KeyedBindingInitialization
  
      [...]
      3. If Initializer is present and v is undefined, then
         a. Let defaultValue be the result of evaluating Initializer.
         b. Let v be GetValue(defaultValue).
         c. ReturnIfAbrupt(v).
      4. Return the result of performing BindingInitialization for BindingPattern
         passing v and environment as arguments.
  ---*/
  
  var callCount = 0;
  function* f({ w: { x, y, z } = { x: 4, y: 5, z: 6 } }) {
    assert.sameValue(x, 4);
    assert.sameValue(y, 5);
    assert.sameValue(z, 6);
  
    assert.throws(ReferenceError, function() {
      w;
    });
    callCount = callCount + 1;
  };
  f({ w: undefined }).next();
  assert.sameValue(callCount, 1, 'generator function invoked exactly once');
  