text: // Copyright (C) 2017 Ecma International.  All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  description: |
      Collection of assertion functions used throughout test262
  defines: [assert]
  ---*/
  
  
  function assert(mustBeTrue, message) {
      if (mustBeTrue === true) {
          return;
      }
  
      if (message === undefined) {
          message = 'Expected true but got ' + assert._toString(mustBeTrue);
      }
      throw (message);
  }
  
  assert._isSameValue = function (a, b) {
      if (a === b) {
          // Handle +/-0 vs. -/+0
          return a !== 0 || 1 / a === 1 / b;
      }
  
      // Handle NaN vs. NaN
      return a !== a && b !== b;
  };
  
  assert.sameValue = function (actual, expected, message) {
      try {
          if (assert._isSameValue(actual, expected)) {
              return;
          }
      } catch (error) {
          throw (message + ' (_isSameValue operation threw) ' + error);
      }
  
      if (message === undefined) {
          message = '';
      } else {
          message += ' ';
      }
  
      message += 'Expected SameValue(«' + assert._toString(actual) + '», «' + assert._toString(expected) + '») to be true';
  
      throw (message);
  };
  
  assert.notSameValue = function (actual, unexpected, message) {
      if (!assert._isSameValue(actual, unexpected)) {
          return;
      }
  
      if (message === undefined) {
          message = '';
      } else {
          message += ' ';
      }
  
      message += 'Expected SameValue(«' + assert._toString(actual) + '», «' + assert._toString(unexpected) + '») to be false';
  
      throw (message);
  };
  
  assert.throws = function (expectedErrorConstructor, func, message) {
      if (typeof func !== "function") {
          throw ('assert.throws requires two arguments: the error constructor ' +
              'and a function to run');
      }
      if (message === undefined) {
          message = '';
      } else {
          message += ' ';
      }
  
      try {
          func();
      } catch (thrown) {
          if (typeof thrown !== 'object' || thrown === null) {
              message += 'Thrown value was not an object!';
              throw (message);
          } else if (thrown.constructor !== expectedErrorConstructor) {
              message += 'Expected a ' + expectedErrorConstructor.name + ' but got a ' + thrown.constructor.name;
              throw (message);
          }
          return;
      }
  
      message += 'Expected a ' + expectedErrorConstructor.name + ' to be thrown but no exception was thrown at all';
      throw (message);
  };
  
  assert._toString = function (value) {
      try {
          if (value === 0 && 1 / value === -Infinity) {
              return '-0';
          }
  
          return String(value);
      } catch (err) {
          if (err.name === 'TypeError') {
              return Object.prototype.toString.call(value);
          }
  
          throw err;
      }
  };
  
  // Copyright (C) 2017 Ecma International.  All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  description: |
      Collection of functions used to safely verify the correctness of
      property descriptors.
  defines:
    - verifyProperty
    - verifyEqualTo
    - verifyWritable
    - verifyNotWritable
    - verifyEnumerable
    - verifyNotEnumerable
    - verifyConfigurable
    - verifyNotConfigurable
  ---*/
  
  // @ts-check
  
  /**
   * @param {object} obj
   * @param {string|symbol} name
   * @param {PropertyDescriptor|undefined} desc
   * @param {object} [options]
   * @param {boolean} [options.restore]
   */
  function verifyProperty(obj, name, desc, options) {
      assert(
          arguments.length > 2,
          'verifyProperty should receive at least 3 arguments: obj, name, and descriptor'
      );
  
      var originalDesc = Object.getOwnPropertyDescriptor(obj, name);
      var nameStr = String(name);
  
      // Allows checking for undefined descriptor if it's explicitly given.
      if (desc === undefined) {
          assert.sameValue(
              originalDesc,
              undefined,
              "obj['" + nameStr + "'] descriptor should be undefined"
          );
  
          // desc and originalDesc are both undefined, problem solved;
          return true;
      }
  
      assert(
          Object.prototype.hasOwnProperty.call(obj, name),
          "obj should have an own property " + nameStr
      );
  
      assert.notSameValue(
          desc,
          null,
          "The desc argument should be an object or undefined, null"
      );
  
      assert.sameValue(
          typeof desc,
          "object",
          "The desc argument should be an object or undefined, " + String(desc)
      );
  
      var failures = [];
  
      if (Object.prototype.hasOwnProperty.call(desc, 'value')) {
          if (!isSameValue(desc.value, originalDesc.value)) {
              failures.push("descriptor value should be " + desc.value);
          }
      }
  
      if (Object.prototype.hasOwnProperty.call(desc, 'enumerable')) {
          if (desc.enumerable !== originalDesc.enumerable ||
              desc.enumerable !== isEnumerable(obj, name)) {
              failures.push('descriptor should ' + (desc.enumerable ? '' : 'not ') + 'be enumerable');
          }
      }
  
      if (Object.prototype.hasOwnProperty.call(desc, 'writable')) {
          if (desc.writable !== originalDesc.writable ||
              desc.writable !== isWritable(obj, name)) {
              failures.push('descriptor should ' + (desc.writable ? '' : 'not ') + 'be writable');
          }
      }
  
      if (Object.prototype.hasOwnProperty.call(desc, 'configurable')) {
          if (desc.configurable !== originalDesc.configurable ||
              desc.configurable !== isConfigurable(obj, name)) {
              failures.push('descriptor should ' + (desc.configurable ? '' : 'not ') + 'be configurable');
          }
      }
  
      assert(!failures.length, failures.join('; '));
  
      if (options && options.restore) {
          Object.defineProperty(obj, name, originalDesc);
      }
  
      return true;
  }
  
  function isConfigurable(obj, name) {
      var hasOwnProperty = Object.prototype.hasOwnProperty;
      try {
          delete obj[name];
      } catch (e) {
          if (!(e instanceof TypeError)) {
              throw ("Expected TypeError, got " + e)
          }
      }
      return !hasOwnProperty.call(obj, name);
  }
  
  function isEnumerable(obj, name) {
      var stringCheck = false;
  
      if (typeof name === "string") {
          for (var x in obj) {
              if (x === name) {
                  stringCheck = true;
                  break;
              }
          }
      } else {
          // skip it if name is not string, works for Symbol names.
          stringCheck = true;
      }
  
      return stringCheck &&
          Object.prototype.hasOwnProperty.call(obj, name) &&
          Object.prototype.propertyIsEnumerable.call(obj, name);
  }
  
  function isSameValue(a, b) {
      if (a === 0 && b === 0) return 1 / a === 1 / b;
      if (a !== a && b !== b) return true;
  
      return a === b;
  }
  
  var __isArray = Array.isArray;
  function isWritable(obj, name, verifyProp, value) {
      var unlikelyValue = __isArray(obj) && name === "length" ?
          Math.pow(2, 32) - 1 :
          "unlikelyValue";
      var newValue = value || unlikelyValue;
      var hadValue = Object.prototype.hasOwnProperty.call(obj, name);
      var oldValue = obj[name];
      var writeSucceeded;
  
      try {
          obj[name] = newValue;
      } catch (e) {
          if (!(e instanceof TypeError)) {
              throw ("Expected TypeError, got " + e);
          }
      }
  
      writeSucceeded = isSameValue(obj[verifyProp || name], newValue);
  
      // Revert the change only if it was successful (in other cases, reverting
      // is unnecessary and may trigger exceptions for certain property
      // configurations)
      if (writeSucceeded) {
          if (hadValue) {
              obj[name] = oldValue;
          } else {
              delete obj[name];
          }
      }
  
      return writeSucceeded;
  }
  
  function verifyEqualTo(obj, name, value) {
      if (!isSameValue(obj[name], value)) {
          throw ("Expected obj[" + String(name) + "] to equal " + value +
              ", actually " + obj[name]);
      }
  }
  
  function verifyWritable(obj, name, verifyProp, value) {
      if (!verifyProp) {
          assert(Object.getOwnPropertyDescriptor(obj, name).writable,
              "Expected obj[" + String(name) + "] to have writable:true.");
      }
      if (!isWritable(obj, name, verifyProp, value)) {
          throw ("Expected obj[" + String(name) + "] to be writable, but was not.");
      }
  }
  
  function verifyNotWritable(obj, name, verifyProp, value) {
      if (!verifyProp) {
          assert(!Object.getOwnPropertyDescriptor(obj, name).writable,
              "Expected obj[" + String(name) + "] to have writable:false.");
      }
      if (isWritable(obj, name, verifyProp)) {
          throw ("Expected obj[" + String(name) + "] NOT to be writable, but was.");
      }
  }
  
  function verifyEnumerable(obj, name) {
      assert(Object.getOwnPropertyDescriptor(obj, name).enumerable,
          "Expected obj[" + String(name) + "] to have enumerable:true.");
      if (!isEnumerable(obj, name)) {
          throw ("Expected obj[" + String(name) + "] to be enumerable, but was not.");
      }
  }
  
  function verifyNotEnumerable(obj, name) {
      assert(!Object.getOwnPropertyDescriptor(obj, name).enumerable,
          "Expected obj[" + String(name) + "] to have enumerable:false.");
      if (isEnumerable(obj, name)) {
          throw ("Expected obj[" + String(name) + "] NOT to be enumerable, but was.");
      }
  }
  
  function verifyConfigurable(obj, name) {
      assert(Object.getOwnPropertyDescriptor(obj, name).configurable,
          "Expected obj[" + String(name) + "] to have configurable:true.");
      if (!isConfigurable(obj, name)) {
          throw ("Expected obj[" + String(name) + "] to be configurable, but was not.");
      }
  }
  
  function verifyNotConfigurable(obj, name) {
      assert(!Object.getOwnPropertyDescriptor(obj, name).configurable,
          "Expected obj[" + String(name) + "] to have configurable:false.");
      if (isConfigurable(obj, name)) {
          throw ("Expected obj[" + String(name) + "] NOT to be configurable, but was.");
      }
  }
  
  function Test262Error(message) {
      this.message = message || "";
  }
  
  Test262Error.prototype.toString = function () {
      return "Test262Error: " + this.message;
  };
  
  // Copyright (C) 2017 Ecma International.  All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  description: |
      Compare the contents of two arrays
  defines: [compareArray]
  ---*/
  
  function compareArray(a, b) {
      if (b.length !== a.length) {
          return false;
      }
  
      for (var i = 0; i < a.length; i++) {
          if (!compareArray.isSameValue(b[i], a[i])) {
              return false;
          }
      }
      return true;
  }
  
  compareArray.isSameValue = function (a, b) {
      if (a === 0 && b === 0) return 1 / a === 1 / b;
      if (a !== a && b !== b) return true;
  
      return a === b;
  };
  
  compareArray.format = function (array) {
      return "[" + array.map(String).join(', ') + "]";
  };
  
  assert.compareArray = function (actual, expected, message) {
      assert(actual != null, "First argument shouldn't be nullish. " + message);
      assert(expected != null, "Second argument shouldn't be nullish. " + message);
      var format = compareArray.format;
      assert(
          compareArray(actual, expected),
          "Expected " + format(actual) + " and " + format(expected) + " to have the same contents. " + message
      );
  };
  // This file was procedurally generated from the following sources:
  // - src/dstr-binding/ary-ptrn-elision-exhausted.case
  // - src/dstr-binding/default/cls-decl-gen-meth-static-dflt.template
  /*---
  description: Elision accepts exhausted iterator (static class expression generator method (default parameter))
  esid: sec-runtime-semantics-bindingclassdeclarationevaluation
  features: [generators, 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
          b. Else,
             Let status be the result of performing PropertyDefinitionEvaluation for
             m with arguments F and false.
      [...]
  
      14.4.13 Runtime Semantics: PropertyDefinitionEvaluation
  
      GeneratorMethod : * PropertyName ( StrictFormalParameters ) { GeneratorBody }
  
      1. Let propKey be the result of evaluating PropertyName.
      2. ReturnIfAbrupt(propKey).
      3. If the function code for this GeneratorMethod is strict mode code,
         let strict be true. Otherwise let strict be false.
      4. Let scope be the running execution context's LexicalEnvironment.
      5. Let closure be GeneratorFunctionCreate(Method,
         StrictFormalParameters, 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.
      [...]
  
      13.3.3.6 Runtime Semantics: IteratorBindingInitialization
  
      ArrayBindingPattern : [ Elision ]
  
      1. Return the result of performing
         IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
         as the argument.
  
      12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
  
      Elision : ,
  
      1. If iteratorRecord.[[done]] is false, then
         [...]
      2. Return NormalCompletion(empty).
  
  ---*/
  var iter = function*() {}();
  iter.next();
  
  var callCount = 0;
  class C {
    static *method([,] = iter) {
      
      callCount = callCount + 1;
    }
  };
  
  C.method().next();
  assert.sameValue(callCount, 1, 'method invoked exactly once');
  