LanguageFeatures/nnbd/type-aliases/null_aware_operator_A07_t02.dart

/*
 * Copyright (c) 2019, 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.
 */
/**
 * @assertion If e1 translates to F then e1[e2] translates to:
 *  PASSTHRU[F, fn[x] => x[EXP(e2)]]
 *
 * @description If e1 translates to F then e1[e2] translates to:
 *  PASSTHRU[F, fn[x] => x[EXP(e2)]]. Test type aliases
 * @author sgrekhov@unipro.ru
 */
// SharedOptions=--enable-experiment=nonfunction-type-aliases
// Requirements=nnbd-strong
import "../../../Utils/expect.dart";

class C {
  int operator[](int index) => index;
}

typedef CAlias1 = C;
typedef CAlias2 = C?;

main() {
  CAlias1 c1 = new C();
  Expect.equals(42, c1[42]);

  CAlias1? c2 = new C();
  if (c2 != null) {
    Expect.equals(42, c2[42]);
  }

  CAlias2 c3 = new C();
  if (c3 != null) {
    Expect.equals(42, c3[42]);
  }

  CAlias2? c4 = new C();
  if (c4 != null) {
    Expect.equals(42, c4[42]);
  }
}