text: // Copyright 2013 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // Flags: --allow-natives-syntax --harmony-tostring
  
  // Test instantations of generators.
  
  // Generators shouldn't allocate stack slots.  This test will abort in debug
  // mode if generators have stack slots.
  function TestContextAllocation() {
    function* g1(a, b, c) { yield 1; return [a, b, c]; }
    function* g2() { yield 1; return arguments; }
    function* g3() { yield 1; return this; }
    function* g4() { var x = 10; yield 1; return x; }
    // Temporary variable context allocation
    function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
  
    g1();
    g2();
    g3();
    g4();
    g5(["foo"]);
  }
  TestContextAllocation();
  
  
  // Test the properties and prototype of a generator object.
  function TestGeneratorObject() {
    function* g() { yield 1; }
  
    var iter = g();
    assertSame(g.prototype, Object.getPrototypeOf(iter));
    assertTrue(iter instanceof g);
    assertEquals("Generator", %_ClassOf(iter));
    assertEquals("[object Generator]", String(iter));
    assertEquals([], Object.getOwnPropertyNames(iter));
    assertTrue(iter !== g());
  
    // g() is the same as new g().
    iter = new g();
    assertSame(g.prototype, Object.getPrototypeOf(iter));
    assertTrue(iter instanceof g);
    assertEquals("Generator", %_ClassOf(iter));
    assertEquals("[object Generator]", String(iter));
    assertEquals("[object Generator]", Object.prototype.toString.call(iter));
    var gf = iter.__proto__.constructor;
    assertEquals("[object GeneratorFunction]", Object.prototype.toString.call(gf));
    assertEquals([], Object.getOwnPropertyNames(iter));
    assertTrue(iter !== new g());
  }
  TestGeneratorObject();
  
  
  // Test the methods of generator objects.
  function TestGeneratorObjectMethods() {
    function* g() { yield 1; }
    var iter = g();
  
    function TestNonGenerator(non_generator) {
      assertThrows(function() { iter.next.call(non_generator); }, TypeError);
      assertThrows(function() { iter.next.call(non_generator, 1); }, TypeError);
      assertThrows(function() { iter.throw.call(non_generator, 1); }, TypeError);
    }
  
    TestNonGenerator(1);
    TestNonGenerator({});
    TestNonGenerator(function(){});
    TestNonGenerator(g);
    TestNonGenerator(g.prototype);
  }
  TestGeneratorObjectMethods();
  