| // 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 = 2.7 |
| |
| import "package:expect/expect.dart"; |
| |
| // Make sure we use JavaScript semantics when compiling compile-time constants. |
| // In this case we test that the value-range analysis uses JavaScript semantics |
| // too. |
| |
| int inscrutable(int x) { |
| if (x == 0) return 0; |
| return x | inscrutable(x & (x - 1)); |
| } |
| |
| foo() { |
| var a = const [1, 2, 3, 4]; |
| var i = 8007199254740992; |
| if (inscrutable(i) == 0) { |
| i++; |
| } |
| i += 1000000000000000; |
| // [i] is now at its maximum 53 bit value. The following increments will not |
| // have any effect. |
| i++; |
| i++; |
| i++; |
| i -= 1000000000000000; |
| i--; |
| i--; |
| i--; |
| i -= 8007199254740992; // In JS semantics [i] would be -3, now. |
| return a[i]; |
| } |
| |
| main() { |
| Expect.throws(() => foo(), (e) => e is RangeError); |
| } |