Reland of Ship ES2015 sloppy-mode function hoisting, let, class

test/mjsunit/es6/block-scope-class.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.
+
+// Test for conflicting variable bindings.
+
+// Flags: --harmony-sloppy --harmony-sloppy-function
+
+function AssertEqualsStrictAndSloppy(value, code) {
+  assertEquals(value, eval("(function() {" + code + "})()"));
+  assertEquals(value, eval("(function() { 'use strict'; " + code + "})()"));
+  assertEquals(value, eval("(function() { var x = 0; {" + code + "} })()"));
+  assertEquals(value, eval("(function() { 'use strict'; var x = 0; {"
+                           + code + "} })()"));
+}
+
+function AssertThrowsStrictAndSloppy(code, error) {
+  assertThrows("(function() {" + code + "})()", error);
+  assertThrows("(function() { 'use strict'; " + code + "})()", error);
+  assertThrows("(function() { var x = 0; { " + code + "} })()", error);
+  assertThrows("(function() { 'use strict'; var x = 0; {" + code + "} })()",
+               error);
+}
+
+(function TestClassTDZ() {
+  AssertEqualsStrictAndSloppy(
+      "x", "function f() { return x; }; class x { }; return f().name;");
+  AssertEqualsStrictAndSloppy
+      ("x", "class x { }; function f() { return x; }; return f().name;");
+  AssertEqualsStrictAndSloppy(
+      "x", "class x { }; var result = f().name; " +
+      "function f() { return x; }; return result;");
+  AssertThrowsStrictAndSloppy(
+      "function f() { return x; }; f(); class x { };", ReferenceError);
+  AssertThrowsStrictAndSloppy(
+      "f(); function f() { return x; }; class x { };", ReferenceError);
+  AssertThrowsStrictAndSloppy(
+      "f(); class x { }; function f() { return x; };", ReferenceError);
+  AssertThrowsStrictAndSloppy(
+      "var x = 1; { f(); class x { }; function f() { return x; }; }",
+      ReferenceError);
+  AssertThrowsStrictAndSloppy("x = 3; class x { };", ReferenceError)
+})();
+
+(function TestClassNameConflict() {
+  AssertThrowsStrictAndSloppy("class x { }; var x;", SyntaxError);
+  AssertThrowsStrictAndSloppy("var x; class x { };", SyntaxError);
+  AssertThrowsStrictAndSloppy("class x { }; function x() { };", SyntaxError);
+  AssertThrowsStrictAndSloppy("function x() { }; class x { };", SyntaxError);
+  AssertThrowsStrictAndSloppy("class x { }; for (var x = 0; false;) { };",
+                              SyntaxError);
+  AssertThrowsStrictAndSloppy("for (var x = 0; false;) { }; class x { };",
+                              SyntaxError);
+})();
+
+(function TestClassMutableBinding() {
+  AssertEqualsStrictAndSloppy(
+      "x3", "class x { }; var y = x.name; x = 3; return y + x;")
+})();