| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import "package:expect/expect.dart"; |
| import 'compiler_helper.dart'; |
| |
| const String TEST1 = r""" |
| main() { |
| var a = [42, null]; |
| return a[0] + 42; |
| } |
| """; |
| |
| const String TEST2 = r""" |
| main() { |
| var a = new List(); |
| a.add(42); |
| a.add(null); |
| return a[0] + 42; |
| } |
| """; |
| |
| const String TEST3 = r""" |
| main() { |
| var a = new List(42); |
| a[0] = 42; |
| return a[0] + 42; |
| } |
| """; |
| |
| |
| main() { |
| String generated = compileAll(TEST1); |
| // Check that we only do a null check on the receiver for |
| // [: a[0] + 42 :]. We can do a null check because we inferred that |
| // the list is of type int or null. |
| Expect.isFalse(generated.contains('if (typeof t1')); |
| Expect.isTrue(generated.contains('if (t1 == null)')); |
| |
| generated = compileAll(TEST2); |
| Expect.isFalse(generated.contains('if (typeof t1')); |
| Expect.isTrue(generated.contains('if (t1 == null)')); |
| |
| generated = compileAll(TEST3); |
| Expect.isFalse(generated.contains('if (typeof t1')); |
| Expect.isTrue(generated.contains('if (t1 == null)')); |
| } |