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      1 // Copyright 2015 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Test for conflicting variable bindings.
      6 
      7 function AssertEqualsStrictAndSloppy(value, code) {
      8   assertEquals(value, eval("(function() {" + code + "})()"));
      9   assertEquals(value, eval("(function() { 'use strict'; " + code + "})()"));
     10   assertEquals(value, eval("(function() { var x = 0; {" + code + "} })()"));
     11   assertEquals(value, eval("(function() { 'use strict'; var x = 0; {"
     12                            + code + "} })()"));
     13 }
     14 
     15 function AssertThrowsStrictAndSloppy(code, error) {
     16   assertThrows("(function() {" + code + "})()", error);
     17   assertThrows("(function() { 'use strict'; " + code + "})()", error);
     18   assertThrows("(function() { var x = 0; { " + code + "} })()", error);
     19   assertThrows("(function() { 'use strict'; var x = 0; {" + code + "} })()",
     20                error);
     21 }
     22 
     23 (function TestClassTDZ() {
     24   AssertEqualsStrictAndSloppy(
     25       "x", "function f() { return x; }; class x { }; return f().name;");
     26   AssertEqualsStrictAndSloppy
     27       ("x", "class x { }; function f() { return x; }; return f().name;");
     28   AssertEqualsStrictAndSloppy(
     29       "x", "class x { }; var result = f().name; " +
     30       "function f() { return x; }; return result;");
     31   AssertThrowsStrictAndSloppy(
     32       "function f() { return x; }; f(); class x { };", ReferenceError);
     33   AssertThrowsStrictAndSloppy(
     34       "f(); function f() { return x; }; class x { };", ReferenceError);
     35   AssertThrowsStrictAndSloppy(
     36       "f(); class x { }; function f() { return x; };", ReferenceError);
     37   AssertThrowsStrictAndSloppy(
     38       "var x = 1; { f(); class x { }; function f() { return x; }; }",
     39       ReferenceError);
     40   AssertThrowsStrictAndSloppy("x = 3; class x { };", ReferenceError)
     41 })();
     42 
     43 (function TestClassNameConflict() {
     44   AssertThrowsStrictAndSloppy("class x { }; var x;", SyntaxError);
     45   AssertThrowsStrictAndSloppy("var x; class x { };", SyntaxError);
     46   AssertThrowsStrictAndSloppy("class x { }; function x() { };", SyntaxError);
     47   AssertThrowsStrictAndSloppy("function x() { }; class x { };", SyntaxError);
     48   AssertThrowsStrictAndSloppy("class x { }; for (var x = 0; false;) { };",
     49                               SyntaxError);
     50   AssertThrowsStrictAndSloppy("for (var x = 0; false;) { }; class x { };",
     51                               SyntaxError);
     52 })();
     53 
     54 (function TestClassMutableBinding() {
     55   AssertEqualsStrictAndSloppy(
     56       "x3", "class x { }; var y = x.name; x = 3; return y + x;")
     57 })();
     58