dart-sdk/tests/language_2/constructor/constructor4_test.dart

// Copyright (c) 2011, 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 constructors and initializers.

// @dart = 2.9

import "package:expect/expect.dart";

// Expect the initializer expressions E(i) to be evaluated
// in the order 1, 2, 3, ...
// Each expression must be evaluated exactly once.

String trace = "";

int E(int i) {
  trace += "$i-";
  return i;
}

class A {
  var a1;
  A() : a1 = E(2) {
    E(3);
  }
}

class B extends A {
  var b1;
  B(x) : b1 = E(1) /* Implicit super call to A's initializers happens here. */ {
    // Implicit super call to A's body happens here.
    E(4);
  }
}

main() {
  var b = new B(0);
  Expect.equals("1-2-3-4-", trace);
}