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28 // Flags: --allow-natives-syntax
30 // Test the handling of initialization of deleted const variables.
31 // This only makes sense in local scopes since the declaration and
32 // initialization of consts in the global scope happen at the same
35 function testIntroduceGlobal() {
37 // Deleting 'x' removes the local const property.
39 // Initialization redefines global 'x'.
40 "const x = 3; assertEquals(3, x);" +
41 // Test constness of the global 'x'.
42 "x = 4; assertEquals(3, x);";
46 testIntroduceGlobal();
47 assertEquals("undefined", typeof x);
49 function testAssignExistingGlobal() {
51 // Delete 'x' to remove the local const property.
53 // Initialization redefines global 'x'.
54 "const x = 5; assertEquals(5, x);" +
55 // Test constness of the global 'x'.
56 "x = 6; assertEquals(5, x);";
60 testAssignExistingGlobal();
61 assertEquals("undefined", typeof x);
63 function testAssignmentArgument(x) {
65 var source = "delete x; const x = 7; assertEquals(7, x)";
69 assertEquals("undefined", typeof x);
72 for (var i = 0; i < 5; i++) {
73 testAssignmentArgument();
75 %OptimizeFunctionOnNextCall(testAssignmentArgument);
76 testAssignmentArgument();
77 assertEquals("undefined", typeof x);
79 __defineSetter__('x', function() { throw 42; });
81 function testRedefineGlobal() {
82 // Initialization redefines global 'x'.
83 var source = "delete x; const x = 8; finished = true;";
90 function testInitFastCaseExtension() {
91 var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)";
95 testInitFastCaseExtension();
97 function testInitSlowCaseExtension() {
99 // Introduce 100 properties on the context extension object to force
101 for (var i = 0; i < 100; i++) source += ("var a" + i + " = " + i + ";");
102 source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)";
106 testInitSlowCaseExtension();
108 function testAssignSurroundingContextSlot() {
111 var source = "delete x; const x = 13; assertEquals(13, x)";
118 testAssignSurroundingContextSlot();