dart-sdk/tests/language/regress/regress45529_test.dart
Regis Crelier d0ee565bf8 [VM/runtime] Fix optimization for reusing instantiator type argument vector.
The bit vector representing the nullability of the types of a type argument vector was stored in reverse order.
This caused a problem when a longer instantiated vector is reused for a shorter uninstantiated vector.

This fixes https://github.com/dart-lang/sdk/issues/45529

TEST=added regression test

Change-Id: I0e936e45d51fa896d7562f4f03c8878437eb464f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/193751
Commit-Queue: Régis Crelier <regis@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
2021-04-01 01:31:33 +00:00

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Dart

// Copyright (c) 2021, 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";
void main() {
final baz = Foo<Null>().baz;
Expect.equals("Baz<Bar<Null>?>", baz.runtimeType.toString());
baz.v = baz.v;
}
class Bar<T> {}
class Foo<T> extends Quux<Bar<T>> {}
class Baz<T> {
Baz(this.v);
T v;
}
class Quux<T> {
final baz = Baz<T?>(null);
}