| // Copyright (c) 2012, 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. |
| // Dart test program for testing arrays. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| bar() => true; |
| |
| tata() => 1.5; |
| |
| // The type propagation in Dart2Js wrongly took the intersection of all incoming |
| // types in a loop-phi. In this case the back-edge brought type 'number' which, |
| // combined with 'integer' (i = 0) was narrowed to 'integer'. As a result no |
| // check was inserted for the list access. |
| foo(a) { |
| var i; |
| if (bar()) { |
| // t's desired type is conflicting. Once it is used as array receiver. And |
| // once as integer. The backward propagation thus can't decide. |
| // The forward declaration, however, will assign type num. |
| dynamic t = 0 + tata(); |
| i = t; |
| if (!bar()) t[0]; |
| } else { |
| i = 0; |
| } |
| for (int j = 0; j < 1; j++) { |
| // The phi, combining the two 'i's must reach the conclusion that i is of |
| // type num and therefore needs a check before accessing the array. |
| a[i]; |
| } |
| } |
| |
| main() { |
| Expect.throws(() => foo([1, 2])); |
| } |