LanguageFeatures/nnbd/late_A03_t04.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 A read of a field or variable which is marked as late which has
/// not yet been written to causes the initializer expression of the variable to
/// be evaluated to a value, assigned to the variable or field, and returned as
/// the value of the read.
/// ...
/// Evaluating the initializer expression may validly cause a write to the field
/// or variable, assuming that the field or variable is not final. In this case,
/// the variable assumes the written value. The final value of the initializer
/// expression overwrites any intermediate written values.
///
/// @description Check that it is a runtime error if initializing expression
/// writes an intermediate value to final field or variable
/// @author sgrekhov@unipro.ru

// Requirements=nnbd-strong
import "../../Utils/expect.dart";

class C {
  static late final String s;
  static void initS(String val) {
    s = val;
    Expect.throws(() {s = "Show must go on";});
  }

  late final String v;
  void initV(String val) {
    v = val;
    Expect.throws(() {v = "Show must go on";});
  }
}

late final String g;

void initG(String val) {
  g = val;
  Expect.throws(() {g = "Show must go on";});
}

main() {
  C.initS("Lily was here");
  Expect.equals("Lily was here", C.s);

  C c = new C();
  c.initV("Lily was here");
  Expect.equals("Lily was here", c.v);

  initG("Lily was here");
  Expect.equals("Lily was here", g);
}