Import tests from Google V8 (Arrow Functions)

These tests are derived from the following files within the Google V8
project:

	test/mjsunit/harmony/arrow-functions.js

test/language/arrow-function/Arrow-Function_rules-for-prototype.js

@@ -0,0 +1,13 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.2
+description: >
+    Arrow functions are like functions, except they throw when using the
+    "new" operator on them.
+---*/
+
+assert.sameValue(typeof (() => {}), "function");
+assert.sameValue(Object.getPrototypeOf(() => {}), Function.prototype);
+assert.throws(TypeError, function() { new (() => {}); });
+assert.sameValue("prototype" in (() => {}), false);

test/language/arrow-function/Arrow-Function_semantics.js

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+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.2
+description: >
+    Semantics associated with specific Arrow Function syntactic forms.
+includes: [compareArray.js]
+---*/
+
+// Empty arrow function returns undefined
+var empty = () => {};
+assert.sameValue(empty(), undefined);
+
+// Single parameter case needs no parentheses around parameter list
+var identity = x => x;
+assert.sameValue(identity(empty), empty);
+
+// No need for parentheses even for lower-precedence expression body
+var square = x => x * x;
+assert.sameValue(square(3), 9);
+
+// Parenthesize the body to return an object literal expression
+var key_maker = val => ({key: val});
+assert.sameValue(key_maker(empty).key, empty);
+
+// Expression Body implicit return
+var evens = [0, 2, 4, 6, 8];
+assert(compareArray(evens.map(v => v + 1), [1, 3, 5, 7, 9]));
+
+// Statement body needs braces, must use 'return' explicitly if not void
+var fives = [];
+[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].forEach(v => {
+  if (v % 5 === 0) fives.push(v);
+});
+assert(compareArray(fives, [5, 10]));

test/language/arrow-function/Arrow-Function_syntax-variations.js

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+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.2
+description: >
+    Syntax variations of valid Arrow Functions
+---*/
+
+assert.sameValue((() => 1)(), 1);
+assert.sameValue((a => a + 1)(1), 2);
+assert.sameValue((() => { return 3; })(), 3);
+assert.sameValue((a => { return a + 3; })(1), 4);
+assert.sameValue(((a, b) => a + b)(1, 4), 5);
+assert.sameValue(((a, b) => { return a + b; })(1, 5), 6);