Remove destructuring and default arguments runtime flags

test/mjsunit/harmony/destructuring-assignment.js

-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-destructuring-assignment --harmony-destructuring-bind
-
-// script-level tests
-var ox, oy = {}, oz;
-({
-  x: ox,
-  y: oy.value,
-  y2: oy["value2"],
-  z: ({ set v(val) { oz = val; } }).v
-} = {
-  x: "value of x",
-  y: "value of y1",
-  y2: "value of y2",
-  z: "value of z"
-});
-assertEquals("value of x", ox);
-assertEquals("value of y1", oy.value);
-assertEquals("value of y2", oy.value2);
-assertEquals("value of z", oz);
-
-[ox, oy.value, oy["value2"], ...{ set v(val) { oz = val; } }.v] = [
-  1007,
-  798432,
-  555,
-  1, 2, 3, 4, 5
-];
-assertEquals(ox, 1007);
-assertEquals(oy.value, 798432);
-assertEquals(oy.value2, 555);
-assertEquals(oz, [1, 2, 3, 4, 5]);
-
-
-(function testInFunction() {
-  var x, y = {}, z;
-  ({
-    x: x,
-    y: y.value,
-    y2: y["value2"],
-    z: ({ set v(val) { z = val; } }).v
-  } = {
-    x: "value of x",
-    y: "value of y1",
-    y2: "value of y2",
-    z: "value of z"
-  });
-  assertEquals("value of x", x);
-  assertEquals("value of y1", y.value);
-  assertEquals("value of y2", y.value2);
-  assertEquals("value of z", z);
-
-  [x, y.value, y["value2"], ...{ set v(val) { z = val; } }.v] = [
-    1007,
-    798432,
-    555,
-    1, 2, 3, 4, 5
-  ];
-  assertEquals(x, 1007);
-  assertEquals(y.value, 798432);
-  assertEquals(y.value2, 555);
-  assertEquals(z, [1, 2, 3, 4, 5]);
-})();
-
-
-(function testArrowFunctionInitializers() {
-  var fn = (config = {
-    value: defaults.value,
-    nada: { nada: defaults.nada } = { nada: "nothing" }
-  } = { value: "BLAH" }) => config;
-  var defaults = {};
-  assertEquals({ value: "BLAH" }, fn());
-  assertEquals("BLAH", defaults.value);
-  assertEquals("nothing", defaults.nada);
-})();
-
-
-(function testArrowFunctionInitializers2() {
-  var fn = (config = [
-    defaults.value,
-    { nada: defaults.nada } = { nada: "nothing" }
-  ] = ["BLAH"]) => config;
-  var defaults = {};
-  assertEquals(["BLAH"], fn());
-  assertEquals("BLAH", defaults.value);
-  assertEquals("nothing", defaults.nada);
-})();
-
-
-(function testFunctionInitializers() {
-  function fn(config = {
-    value: defaults.value,
-    nada: { nada: defaults.nada } = { nada: "nothing" }
-  } = { value: "BLAH" }) {
-    return config;
-  }
-  var defaults = {};
-  assertEquals({ value: "BLAH" }, fn());
-  assertEquals("BLAH", defaults.value);
-  assertEquals("nothing", defaults.nada);
-})();
-
-
-(function testFunctionInitializers2() {
-  function fn(config = [
-    defaults.value,
-    { nada: defaults.nada } = { nada: "nothing" }
-  ] = ["BLAH"]) { return config; }
-  var defaults = {};
-  assertEquals(["BLAH"], fn());
-  assertEquals("BLAH", defaults.value);
-  assertEquals("nothing", defaults.nada);
-})();
-
-
-(function testDeclarationInitializers() {
-  var defaults = {};
-  var { value } = { value: defaults.value } = { value: "BLAH" };
-  assertEquals("BLAH", value);
-  assertEquals("BLAH", defaults.value);
-})();
-
-
-(function testDeclarationInitializers2() {
-  var defaults = {};
-  var [value] = [defaults.value] = ["BLAH"];
-  assertEquals("BLAH", value);
-  assertEquals("BLAH", defaults.value);
-})();
-
-
-(function testObjectLiteralProperty() {
-  var ext = {};
-  var obj = {
-    a: { b: ext.b, c: ext["c"], d: { set v(val) { ext.d = val; } }.v } = {
-      b: "b", c: "c", d: "d" }
-  };
-  assertEquals({ b: "b", c: "c", d: "d" }, ext);
-  assertEquals({ a: { b: "b", c: "c", d: "d" } }, obj);
-})();
-
-
-(function testArrayLiteralProperty() {
-  var ext = {};
-  var obj = [
-    ...[ ext.b, ext["c"], { set v(val) { ext.d = val; } }.v ] = [
-      "b", "c", "d" ]
-  ];
-  assertEquals({ b: "b", c: "c", d: "d" }, ext);
-  assertEquals([ "b", "c", "d" ], obj);
-})();
-
-
-// TODO(caitp): add similar test for ArrayPatterns, once Proxies support
-// delegating symbol-keyed get/set.
-(function testObjectPatternOperationOrder() {
-  var steps = [];
-  var store = {};
-  function computePropertyName(name) {
-    steps.push("compute name: " + name);
-    return name;
-  }
-  function loadValue(descr, value) {
-    steps.push("load: " + descr + " > " + value);
-    return value;
-  }
-  function storeValue(descr, name, value) {
-    steps.push("store: " + descr + " = " + value);
-    store[name] = value;
-  }
-  var result = {
-    get a() { assertUnreachable(); },
-    set a(value) { storeValue("result.a", "a", value); },
-    get b() { assertUnreachable(); },
-    set b(value) { storeValue("result.b", "b", value); }
-  };
-
-  ({
-    obj: {
-      x: result.a = 10,
-      [computePropertyName("y")]: result.b = false,
-    } = {}
-  } = { obj: {
-    get x() { return loadValue(".temp.obj.x", undefined); },
-    set x(value) { assertUnreachable(); },
-    get y() { return loadValue(".temp.obj.y", undefined); },
-    set y(value) { assertUnreachable(); }
-  }});
-
-  assertPropertiesEqual({
-    a: 10,
-    b: false
-  }, store);
-
-  assertArrayEquals([
-    "load: .temp.obj.x > undefined",
-    "store: result.a = 10",
-
-    "compute name: y",
-    "load: .temp.obj.y > undefined",
-    "store: result.b = false"
-  ], steps);
-
-  steps = [];
-
-  ({
-    obj: {
-      x: result.a = 50,
-      [computePropertyName("y")]: result.b = "hello",
-    } = {}
-  } = { obj: {
-    get x() { return loadValue(".temp.obj.x", 20); },
-    set x(value) { assertUnreachable(); },
-    get y() { return loadValue(".temp.obj.y", true); },
-    set y(value) { assertUnreachable(); }
-  }});
-
-  assertPropertiesEqual({
-    a: 20,
-    b: true
-  }, store);
-
-  assertArrayEquals([
-    "load: .temp.obj.x > 20",
-    "store: result.a = 20",
-    "compute name: y",
-    "load: .temp.obj.y > true",
-    "store: result.b = true",
-  ], steps);
-})();
-
-// Credit to Mike Pennisi and other Test262 contributors for originally writing
-// the testse the following are based on.
-(function testArrayElision() {
-  var value = [1, 2, 3, 4, 5, 6, 7, 8, 9];
-  var a, obj = {};
-  var result = [, a, , obj.b, , ...obj["rest"]] = value;
-
-  assertEquals(result, value);
-  assertEquals(2, a);
-  assertEquals(4, obj.b);
-  assertArrayEquals([6, 7, 8, 9], obj.rest);
-})();
-
-(function testArrayElementInitializer() {
-  function test(value, initializer, expected) {
-    var a, obj = {};
-    var initialized = false;
-    var shouldBeInitialized = value[0] === undefined;
-    assertEquals(value, [ a = (initialized = true, initializer) ] = value);
-    assertEquals(expected, a);
-    assertEquals(shouldBeInitialized, initialized);
-
-    var initialized2 = false;
-    assertEquals(value, [ obj.a = (initialized2 = true, initializer) ] = value);
-    assertEquals(expected, obj.a);
-    assertEquals(shouldBeInitialized, initialized2);
-  }
-
-  test([], "BAM!", "BAM!");
-  test([], "BOOP!", "BOOP!");
-  test([null], 123, null);
-  test([undefined], 456, 456);
-  test([,], "PUPPIES", "PUPPIES");
-
-  (function accept_IN() {
-    var value = [], x;
-    assertEquals(value, [ x = 'x' in {} ] = value);
-    assertEquals(false, x);
-  })();
-
-  (function ordering() {
-    var x = 0, a, b, value = [];
-    assertEquals(value, [ a = x += 1, b = x *= 2 ] = value);
-    assertEquals(1, a);
-    assertEquals(2, b);
-    assertEquals(2, x);
-  })();
-
-  (function yieldExpression() {
-    var value = [], it, result, x;
-    it = (function*() {
-      result = [ x = yield ] = value;
-    })();
-    var next = it.next();
-
-    assertEquals(undefined, result);
-    assertEquals(undefined, next.value);
-    assertEquals(false, next.done);
-    assertEquals(undefined, x);
-
-    next = it.next(86);
-
-    assertEquals(value, result);
-    assertEquals(undefined, next.value);
-    assertEquals(true, next.done);
-    assertEquals(86, x);
-  })();
-
-  (function yieldIdentifier() {
-    var value = [], yield = "BOOP!", x;
-    assertEquals(value, [ x = yield ] = value);
-    assertEquals("BOOP!", x);
-  })();
-
-  assertThrows(function let_TDZ() {
-    "use strict";
-    var x;
-    [ x = y ] = [];
-    let y;
-  }, ReferenceError);
-})();
-
-
-(function testArrayElementNestedPattern() {
-  assertThrows(function nestedArrayRequireObjectCoercibleNull() {
-    var x; [ [ x ] ] = [ null ];
-  }, TypeError);
-
-  assertThrows(function nestedArrayRequireObjectCoercibleUndefined() {
-    var x; [ [ x ] ] = [ undefined ];
-  }, TypeError);
-
-  assertThrows(function nestedArrayRequireObjectCoercibleUndefined2() {
-    var x; [ [ x ] ] = [ ];
-  }, TypeError);
-
-  assertThrows(function nestedArrayRequireObjectCoercibleUndefined3() {
-    var x; [ [ x ] ] = [ , ];
-  }, TypeError);
-
-  assertThrows(function nestedObjectRequireObjectCoercibleNull() {
-    var x; [ { x } ] = [ null ];
-  }, TypeError);
-
-  assertThrows(function nestedObjectRequireObjectCoercibleUndefined() {
-    var x; [ { x } ] = [ undefined ];
-  }, TypeError);
-
-  assertThrows(function nestedObjectRequireObjectCoercibleUndefined2() {
-    var x; [ { x } ] = [ ];
-  }, TypeError);
-
-  assertThrows(function nestedObjectRequireObjectCoercibleUndefined3() {
-    var x; [ { x } ] = [ , ];
-  }, TypeError);
-
-  (function nestedArray() {
-    var x, value = [ [ "zap", "blonk" ] ];
-    assertEquals(value, [ [ , x ] ] = value);
-    assertEquals("blonk", x);
-  })();
-
-  (function nestedObject() {
-    var x, value = [ { a: "zap", b: "blonk" } ];
-    assertEquals(value, [ { b: x } ] = value);
-    assertEquals("blonk", x);
-  })();
-})();
-
-(function testArrayRestElement() {
-  (function testBasic() {
-    var x, rest, array = [1, 2, 3];
-    assertEquals(array, [x, ...rest] = array);
-    assertEquals(1, x);
-    assertEquals([2, 3], rest);
-
-    array = [4, 5, 6];
-    assertEquals(array, [, ...rest] = array);
-    assertEquals([5, 6], rest);
-
-  })();
-
-  (function testNestedRestObject() {
-    var value = [1, 2, 3], x;
-    assertEquals(value, [...{ 1: x }] = value);
-    assertEquals(2, x);
-  })();
-
-  (function iterable() {
-    var count = 0;
-    var x, y, z;
-    function* g() {
-      count++;
-      yield;
-      count++;
-      yield;
-      count++;
-      yield;
-    }
-    var it = g();
-    assertEquals(it, [...x] = it);
-    assertEquals([undefined, undefined, undefined], x);
-    assertEquals(3, count);
-
-    it = [g()];
-    assertEquals(it, [ [...y] ] = it);
-    assertEquals([undefined, undefined, undefined], y);
-    assertEquals(6, count);
-
-    it = { a: g() };
-    assertEquals(it, { a: [...z] } = it);
-    assertEquals([undefined, undefined, undefined], z);
-    assertEquals(9, count);
-  })();
-})();
-
-(function testRequireObjectCoercible() {
-  assertThrows(() => ({} = undefined), TypeError);
-  assertThrows(() => ({} = null), TypeError);
-  assertThrows(() => [] = undefined, TypeError);
-  assertThrows(() => [] = null, TypeError);
-  assertEquals("test", ({} = "test"));
-  assertEquals("test", [] = "test");
-  assertEquals(123, ({} = 123));
-})();
-
-(function testConstReassignment() {
-  "use strict";
-  const c = "untouchable";
-  assertThrows(() => { [ c ] = [ "nope!" ]; }, TypeError);
-  assertThrows(() => { [ [ c ] ]  = [ [ "nope!" ] ]; }, TypeError);
-  assertThrows(() => { [ { c } ]  = [ { c: "nope!" } ]; }, TypeError);
-  assertThrows(() => { ({ c } = { c: "nope!" }); }, TypeError);
-  assertThrows(() => { ({ a: { c } } = { a: { c: "nope!" } }); }, TypeError);
-  assertThrows(() => { ({ a: [ c ] } = { a: [ "nope!" ] }); }, TypeError);
-  assertEquals("untouchable", c);
-})();
-
-(function testForIn() {
-  var log = [];
-  var x = {};
-  var object = {
-    "Apenguin": 1,
-    "\u{1F382}cake": 2,
-    "Bpuppy": 3,
-    "Cspork": 4
-  };
-  for ([x.firstLetter, ...x.rest] in object) {
-    if (x.firstLetter === "A") {
-      assertEquals(["p", "e", "n", "g", "u", "i", "n"], x.rest);
-      continue;
-    }
-    if (x.firstLetter === "C") {
-      assertEquals(["s", "p", "o", "r", "k"], x.rest);
-      break;
-    }
-    log.push({ firstLetter: x.firstLetter, rest: x.rest });
-  }
-  assertEquals([
-    { firstLetter: "\u{1F382}", rest: ["c", "a", "k", "e"] },
-    { firstLetter: "B", rest: ["p", "u", "p", "p", "y"] },
-  ], log);
-})();
-
-(function testForOf() {
-  var log = [];
-  var x = {};
-  var names = [
-    "Apenguin",
-    "\u{1F382}cake",
-    "Bpuppy",
-    "Cspork"
-  ];
-  for ([x.firstLetter, ...x.rest] of names) {
-    if (x.firstLetter === "A") {
-      assertEquals(["p", "e", "n", "g", "u", "i", "n"], x.rest);
-      continue;
-    }
-    if (x.firstLetter === "C") {
-      assertEquals(["s", "p", "o", "r", "k"], x.rest);
-      break;
-    }
-    log.push({ firstLetter: x.firstLetter, rest: x.rest });
-  }
-  assertEquals([
-    { firstLetter: "\u{1F382}", rest: ["c", "a", "k", "e"] },
-    { firstLetter: "B", rest: ["p", "u", "p", "p", "y"] },
-  ], log);
-})();